gluon.rewrite 源代码

# -*- coding: utf-8 -*-

"""
| This file is part of the web2py Web Framework
| Copyrighted by Massimo Di Pierro <mdipierro@cs.depaul.edu>
| License: LGPLv3 (http://www.gnu.org/licenses/lgpl.html)

gluon.rewrite parses incoming URLs and formats outgoing URLs for gluon.html.URL.

In addition, it rewrites both incoming and outgoing URLs based on the (optional) user-supplied routes.py,
which also allows for rewriting of certain error messages.

routes.py supports two styles of URL rewriting, depending on whether 'routers' is defined.
Refer to router.example.py and routes.example.py for additional documentation.

"""

import os
import re
import logging
import traceback
import threading
from gluon.storage import Storage, List
from gluon.http import HTTP
from gluon.fileutils import abspath, read_file
from gluon.settings import global_settings
from gluon._compat import (
    urllib_unquote,
    urllib_quote,
    iteritems,
    xrange,
    urllib_quote_plus,
)

isdir = os.path.isdir
isfile = os.path.isfile
exists = os.path.exists
pjoin = os.path.join

logger = logging.getLogger("web2py.rewrite")
THREAD_LOCAL = threading.local()  # thread-local storage for routing params

REGEX_AT = re.compile(r"(?<!\\)\$[a-zA-Z]\w*")
REGEX_ANYTHING = re.compile(r"(?<!\\)\$anything")
REGEX_REDIRECT = re.compile(r"(\d+)->(.*)")
REGEX_VERSION = re.compile(r"^(_[\d]+\.[\d]+\.[\d]+)$")

# pattern to find valid paths in url /application/controller/...
#   this could be:
#     for static pages:
#        /<b:application>/static/<x:file>
#     for dynamic pages:
#        /<a:application>[/<c:controller>[/<f:function>[.<e:ext>][/<s:args>]]]
#   application, controller, function and ext may only contain [a-zA-Z0-9_]
#   file and args may also contain '-', '=', '.' and '/'
#   apps in routes_apps_raw must parse raw_args into args

REGEX_URL = re.compile(
    r"^/((?P<a>\w+)(/(?P<c>\w+)(/(?P<z>(?P<f>\w+)(\.(?P<e>[\w.]+))?(?P<s>.*)))?)?)?$"
)
REGEX_ARGS = re.compile(r"[^\w/.@=-]")


def _router_default():
    """Returns new copy of default base router"""
    router = Storage(
        default_application="init",
        applications="ALL",
        default_controller="default",
        controllers="DEFAULT",
        default_function="index",
        functions=dict(),
        default_language=None,
        languages=None,
        root_static=["favicon.ico", "robots.txt"],
        map_static=None,
        domains=None,
        exclusive_domain=False,
        map_hyphen=False,
        acfe_match=r"\w+$",  # legal app/ctlr/fcn/ext
        #
        #  Implementation note:
        #  The file_match & args_match patterns use look-behind to avoid
        #  pathological backtracking from nested patterns.
        #
        file_match=r"([+=@$%\w-]|(?<=[+=@$%\w-])[./])*$",  # legal static subpath
        args_match=r"([\w@ =-]|(?<=[\w@ -])\.)*$",
    )
    return router


def _params_default(app=None):
    """Returns a new copy of default parameters"""
    p = Storage()
    p.name = app or "BASE"
    p.default_application = app or "init"
    p.default_controller = "default"
    p.default_function = "index"
    p.routes_app = []
    p.routes_in = []
    p.routes_out = []
    p.routes_onerror = []
    p.routes_apps_raw = []
    p.error_handler = None
    p.error_message = "<html><body><h1>%s</h1></body></html>"
    p.error_message_ticket = (
        '<html><body><h1>Internal error</h1>Ticket issued: <a href="/admin/default/ticket/%(ticket)s" target="_blank">%(ticket)s</a></body><!-- this is junk text else IE does not display the page: '
        + ("x" * 512)
        + " //--></html>"
    )
    p.routers = None
    p.logging = "off"
    return p


params_apps = dict()
params = _params_default(app=None)  # regex rewrite parameters
THREAD_LOCAL.routes = params  # default to base regex rewrite parameters
routers = None


[文档]def log_rewrite(string): """Log rewrite activity under control of routes.py""" if params.logging == "debug": # catch common cases first logger.debug(string) elif params.logging == "off" or not params.logging: pass elif params.logging == "print": print(string) elif params.logging == "info": logger.info(string) elif params.logging == "warning": logger.warning(string) elif params.logging == "error": logger.error(string) elif params.logging == "critical": logger.critical(string) else: logger.debug(string)
ROUTER_KEYS = set( ( "default_application", "applications", "default_controller", "controllers", "default_function", "functions", "default_language", "languages", "domain", "domains", "root_static", "path_prefix", "exclusive_domain", "map_hyphen", "map_static", "acfe_match", "file_match", "args_match", ) ) ROUTER_BASE_KEYS = set( ("applications", "default_application", "domains", "path_prefix") ) # The external interface to rewrite consists of: # # load: load routing configuration file(s) # url_in: parse and rewrite incoming URL # url_out: assemble and rewrite outgoing URL # # THREAD_LOCAL.routes.default_application # THREAD_LOCAL.routes.error_message # THREAD_LOCAL.routes.error_message_ticket # THREAD_LOCAL.routes.try_redirect_on_error # THREAD_LOCAL.routes.error_handler # # filter_url: helper for doctest & unittest # filter_err: helper for doctest & unittest # regex_filter_out: doctest
[文档]def fixup_missing_path_info(environ): eget = environ.get path_info = eget("PATH_INFO") request_uri = eget("REQUEST_URI") if not path_info and request_uri: # for fcgi, get path_info and # query_string from request_uri items = request_uri.split("?") path_info = environ["PATH_INFO"] = items[0] environ["QUERY_STRING"] = items[1] if len(items) > 1 else "" elif not request_uri: query_string = eget("QUERY_STRING") if query_string: environ["REQUEST_URI"] = "%s?%s" % (path_info, query_string) else: environ["REQUEST_URI"] = path_info if not eget("HTTP_HOST"): environ["HTTP_HOST"] = "%s:%s" % (eget("SERVER_NAME"), eget("SERVER_PORT"))
[文档]def url_in(request, environ): """Parses and rewrites incoming URL""" if routers: return map_url_in(request, environ) return regex_url_in(request, environ)
[文档]def url_out( request, environ, application, controller, function, args, other, scheme, host, port, language=None, ): """Assembles and rewrites outgoing URL""" if routers: acf = map_url_out( request, environ, application, controller, function, args, other, scheme, host, port, language, ) url = "%s%s" % (acf, other) else: url = "/%s/%s/%s%s" % (application, controller, function, other) url = regex_filter_out(url, environ) # # fill in scheme and host if absolute URL is requested # scheme can be a string, eg 'http', 'https', 'ws', 'wss' # if host is True or (host is None and (scheme or port is not None)): host = request.env.http_host if not scheme or scheme is True: scheme = ( request.env.get("wsgi_url_scheme", "http").lower() if request else "http" ) if host: host_port = host if not port else host.split(":", 1)[0] + ":%s" % port url = "%s://%s%s" % (scheme, host_port, url) return url
[文档]def try_rewrite_on_error(http_response, request, environ, ticket=None): """ Called from main.wsgibase to rewrite the http response. """ status = int(str(http_response.status).split()[0]) if status >= 399 and THREAD_LOCAL.routes.routes_onerror: keys = set( ( "%s/%s" % (request.application, status), "%s/*" % (request.application), "*/%s" % (status), "*/*", ) ) for (key, uri) in THREAD_LOCAL.routes.routes_onerror: if key in keys: if uri == "!": # do nothing! return http_response, environ elif "?" in uri: path_info, query_string = uri.split("?", 1) query_string += "&" else: path_info, query_string = uri, "" query_string += "code=%s&ticket=%s&requested_uri=%s&request_url=%s" % ( status, ticket, urllib_quote_plus(request.env.request_uri), request.url, ) if uri.startswith("http://") or uri.startswith("https://"): # make up a response url = "%s?%s" % (path_info, query_string) message = 'You are being redirected <a href="%s">here</a>' return HTTP(303, message % url, Location=url), environ elif not environ.get("__ROUTES_ONERROR__", False): # wsgibase will be called recursively with # the routes_onerror path. environ["__ROUTES_ONERROR__"] = True # limit recursion path_info = "/" + path_info.lstrip("/") environ["PATH_INFO"] = path_info environ["QUERY_STRING"] = query_string environ["WEB2PY_STATUS_CODE"] = status return None, environ # do nothing! return http_response, environ
[文档]def try_redirect_on_error(http_object, request, ticket=None): """Called from main.wsgibase to rewrite the http response""" status = int(str(http_object.status).split()[0]) if status > 399 and THREAD_LOCAL.routes.routes_onerror: keys = set( ( "%s/%s" % (request.application, status), "%s/*" % (request.application), "*/%s" % (status), "*/*", ) ) for (key, redir) in THREAD_LOCAL.routes.routes_onerror: if key in keys: if redir == "!": break elif "?" in redir: url = "%s&code=%s&ticket=%s&requested_uri=%s&request_url=%s" % ( redir, status, ticket, urllib_quote_plus(request.env.request_uri), request.url, ) else: url = "%s?code=%s&ticket=%s&requested_uri=%s&request_url=%s" % ( redir, status, ticket, urllib_quote_plus(request.env.request_uri), request.url, ) return HTTP( 303, 'You are being redirected <a href="%s">here</a>' % url, Location=url, ) return http_object
[文档]def load(routes="routes.py", app=None, data=None, rdict=None): """ load: read (if file) and parse routes store results in params (called from main.py at web2py initialization time) If data is present, it's used instead of the routes.py contents. If rdict is present, it must be a dict to be used for routers (unit test) """ global params global routers if app is None: # reinitialize global params_apps params_apps = dict() params = _params_default(app=None) # regex rewrite parameters THREAD_LOCAL.routes = params # default to base regex rewrite parameters routers = None if isinstance(rdict, dict): symbols = dict(routers=rdict) path = "rdict" else: if data is not None: path = "routes" else: if app is None: path = abspath(routes) else: path = abspath("applications", app, routes) if not exists(path): return data = read_file(path).replace("\r\n", "\n") symbols = dict(app=app) try: exec(data, symbols) except SyntaxError as e: logger.error( "%s has a syntax error and will not be loaded\n" % path + traceback.format_exc() ) raise e p = _params_default(app) for sym in ("routes_app", "routes_in", "routes_out"): if sym in symbols: for items in symbols[sym]: p[sym].append(compile_regex(*items)) for sym in ( "routes_onerror", "routes_apps_raw", "error_handler", "error_message", "error_message_ticket", "default_application", "default_controller", "default_function", "logging", ): if sym in symbols: p[sym] = symbols[sym] if "routers" in symbols: p.routers = Storage(symbols["routers"]) for key in p.routers: if isinstance(p.routers[key], dict): p.routers[key] = Storage(p.routers[key]) if app is None: params = p # install base rewrite parameters THREAD_LOCAL.routes = params # install default as current routes # # create the BASE router if routers in use # routers = params.routers # establish routers if present if isinstance(routers, dict): routers = Storage(routers) if routers is not None: router = _router_default() if routers.BASE: router.update(routers.BASE) routers.BASE = router # scan each app in applications/ # create a router, if routers are in use # parse the app-specific routes.py if present # all_apps = [] apppath = abspath("applications") for appname in os.listdir(apppath): if ( not appname.startswith(".") and isdir(abspath(apppath, appname)) and isdir(abspath(apppath, appname, "controllers")) ): all_apps.append(appname) if routers: router = Storage(routers.BASE) # new copy if appname in routers: for key in routers[appname].keys(): if key in ROUTER_BASE_KEYS: raise SyntaxError( "BASE-only key '%s' in router '%s'" % (key, appname) ) router.update(routers[appname]) routers[appname] = router if exists(abspath("applications", appname, routes)): load(routes, appname) if routers: load_routers(all_apps) else: # app params_apps[app] = p if routers and p.routers: if app in p.routers: routers[app].update(p.routers[app]) log_rewrite("URL rewrite is on. configuration in %s" % path)
[文档]def compile_regex(k, v, env=None): """ Preprocess and compile the regular expressions in routes_app/in/out The resulting regex will match a pattern of the form:: [remote address]:[protocol]://[host]:[method] [path] We allow abbreviated regexes on input; here we try to complete them. """ k0 = k # original k for error reporting # bracket regex in ^...$ if not already done if not k[0] == "^": k = "^%s" % k if not k[-1] == "$": k = "%s$" % k # if there are no :-separated parts, prepend a catch-all for the IP address if k.find(":") < 0: # k = '^.*?:%s' % k[1:] k = "^.*?:https?://[^:/]+:[a-z]+ %s" % k[1:] # if there's no ://, provide a catch-all for the protocol, host & method if k.find("://") < 0: i = k.find(":/") if i < 0: raise SyntaxError( "routes pattern syntax error: path needs leading '/' [%s]" % k0 ) k = "%s:https?://[^:/]+:[a-z]+ %s" % (k[:i], k[i + 1 :]) # $anything -> ?P<anything>.* for item in REGEX_ANYTHING.findall(k): k = k.replace(item, "(?P<anything>.*)") # $a (etc) -> ?P<a>\w+ for item in REGEX_AT.findall(k): k = k.replace(item, r"(?P<%s>\w+)" % item[1:]) # same for replacement pattern, but with \g for item in REGEX_AT.findall(v): v = v.replace(item, r"\g<%s>" % item[1:]) return (re.compile(k, re.DOTALL), v, env or {})
[文档]def load_routers(all_apps): """Load-time post-processing of routers""" for app in routers: # initialize apps with routers that aren't present, # on behalf of unit tests if app not in all_apps: all_apps.append(app) router = Storage(routers.BASE) # new copy if app != "BASE": keys = set(routers[app]).intersection(ROUTER_BASE_KEYS) if keys: raise SyntaxError( "BASE-only key(s) %s in router '%s'" % (tuple(keys), app) ) router.update(routers[app]) routers[app] = router router = routers[app] keys = set(router).difference(ROUTER_KEYS) if keys: raise SyntaxError("unknown key(s) %s in router '%s'" % (tuple(keys), app)) if not router.controllers: router.controllers = set() elif not isinstance(router.controllers, str): router.controllers = set(router.controllers) if router.languages: router.languages = set(router.languages) else: router.languages = set() if router.functions: if isinstance(router.functions, (set, tuple, list)): functions = set(router.functions) if isinstance(router.default_function, str): functions.add(router.default_function) # legacy compatibility router.functions = {router.default_controller: functions} for controller in router.functions: router.functions[controller] = set(router.functions[controller]) else: router.functions = dict() if app != "BASE": for base_only in ROUTER_BASE_KEYS: router.pop(base_only, None) if "domain" in router: routers.BASE.domains[router.domain] = app if isinstance(router.controllers, str) and router.controllers == "DEFAULT": router.controllers = set() if isdir(abspath("applications", app)): cpath = abspath("applications", app, "controllers") for cname in os.listdir(cpath): if isfile(abspath(cpath, cname)) and cname.endswith(".py"): router.controllers.add(cname[:-3]) if router.controllers: router.controllers.add("static") router.controllers.add(router.default_controller) if ( isinstance(routers.BASE.applications, str) and routers.BASE.applications == "ALL" ): routers.BASE.applications = list(all_apps) if routers.BASE.applications: routers.BASE.applications = set(routers.BASE.applications) else: routers.BASE.applications = set() for app in routers.keys(): # set router name router = routers[app] router.name = app # compile URL validation patterns router._acfe_match = re.compile(router.acfe_match) router._file_match = re.compile(router.file_match) if router.args_match: router._args_match = re.compile(router.args_match) # convert path_prefix to a list of path elements if router.path_prefix: if isinstance(router.path_prefix, str): router.path_prefix = router.path_prefix.strip("/").split("/") # rewrite BASE.domains as tuples # # key: 'domain[:port]' -> (domain, port) # value: 'application[/controller] -> (application, controller) # (port and controller may be None) # domains = dict() if routers.BASE.domains: for (d, a) in iteritems(routers.BASE.domains): (domain, app) = (d.strip(":"), a.strip("/")) if ":" in domain: (domain, port) = domain.split(":") else: port = None if "/" in app: (app, ctlr) = app.split("/", 1) else: ctlr = None if ctlr and "/" in ctlr: (ctlr, fcn) = ctlr.split("/") else: fcn = None if app not in all_apps and app not in routers: raise SyntaxError("unknown app '%s' in domains" % app) domains[(domain, port)] = (app, ctlr, fcn) routers.BASE.domains = domains
[文档]def regex_uri(e, regexes, tag, default=None): """Filters incoming URI against a list of regexes""" path = e["PATH_INFO"] host = e.get("HTTP_HOST", e.get("SERVER_NAME", "localhost")).lower() i = host.find(":") if i > 0: host = host[:i] key = "%s:%s://%s:%s %s" % ( e.get("REMOTE_ADDR", "localhost"), e.get("wsgi.url_scheme", "http").lower(), host, e.get("REQUEST_METHOD", "get").lower(), path, ) for (regex, value, custom_env) in regexes: if regex.match(key): e.update(custom_env) rewritten = regex.sub(value, key) log_rewrite("%s: [%s] [%s] -> %s" % (tag, key, value, rewritten)) return rewritten log_rewrite("%s: [%s] -> %s (not rewritten)" % (tag, key, default)) return default
[文档]def regex_select(env=None, app=None, request=None): """ Selects a set of regex rewrite params for the current request """ if app: THREAD_LOCAL.routes = params_apps.get(app, params) elif env and params.routes_app: if routers: map_url_in(request, env, app=True) else: app = regex_uri(env, params.routes_app, "routes_app") THREAD_LOCAL.routes = params_apps.get(app, params) else: THREAD_LOCAL.routes = params # default to base rewrite parameters log_rewrite("select routing parameters: %s" % THREAD_LOCAL.routes.name) return app # for doctest
[文档]def regex_filter_in(e): """Regex rewrite incoming URL""" routes = THREAD_LOCAL.routes query = e.get("QUERY_STRING", None) e["WEB2PY_ORIGINAL_URI"] = e["PATH_INFO"] + (query and ("?" + query) or "") if routes.routes_in: path = regex_uri(e, routes.routes_in, "routes_in", e["PATH_INFO"]) rmatch = REGEX_REDIRECT.match(path) if rmatch: raise HTTP(int(rmatch.group(1)), location=rmatch.group(2)) items = path.split("?", 1) e["PATH_INFO"] = items[0] if len(items) > 1: if query: query = "%s&%s" % (items[1], query) else: query = items[1] e["QUERY_STRING"] = query if query: e["REQUEST_URI"] = "%s?%s" % (e["PATH_INFO"], query) else: e["REQUEST_URI"] = e["PATH_INFO"] return e
[文档]def sluggify(key): return key.lower().replace(".", "_")
[文档]def invalid_url(routes): raise HTTP( 400, routes.error_message % "invalid request", web2py_error="invalid path" )
[文档]def regex_url_in(request, environ): """Rewrites and parses incoming URL""" # ################################################## # select application # rewrite URL if routes_in is defined # update request.env # ################################################## regex_select(env=environ, request=request) routes = THREAD_LOCAL.routes if routes.routes_in: environ = regex_filter_in(environ) request.env.update((k.lower().replace(".", "_"), v) for k, v in iteritems(environ)) # ################################################## # serve if a static file # ################################################## path = urllib_unquote(request.env.path_info) or "/" path = path.replace("\\", "/") if path.endswith("/") and len(path) > 1: path = path[:-1] match = REGEX_URL.match(path) if not match: invalid_url(routes) request.raw_args = match.group("s") or "" if request.raw_args.startswith("/"): request.raw_args = request.raw_args[1:] if match.group("c") == "static": application = match.group("a") version, filename = None, match.group("z") if not filename: raise HTTP(404) filename = filename.replace(" ", "_") items = filename.split("/", 1) if REGEX_VERSION.match(items[0]): version, filename = items static_folder = pjoin( global_settings.applications_parent, "applications", application, "static" ) static_file = os.path.abspath(pjoin(static_folder, filename)) if not static_file.startswith(static_folder): invalid_url(routes) return (static_file, version, environ) else: # ################################################## # parse application, controller and function # ################################################## request.application = match.group("a") or routes.default_application request.controller = match.group("c") or routes.default_controller request.function = match.group("f") or routes.default_function request.raw_extension = match.group("e") request.extension = request.raw_extension or "html" if request.application in routes.routes_apps_raw: # application is responsible for parsing args request.args = None elif request.raw_args: args = REGEX_ARGS.sub("_", request.raw_args) request.args = List(args.split("/")) else: request.args = List([]) return (None, None, environ)
[文档]def regex_filter_out(url, e=None): """Regex rewrite outgoing URL""" if not hasattr(THREAD_LOCAL, "routes"): regex_select() # ensure routes is set (for application threads) routes = THREAD_LOCAL.routes if routers: return url # already filtered if routes.routes_out: items = url.split("?", 1) if e: host = e.get("http_host", "localhost").lower() i = host.find(":") if i > 0: host = host[:i] items[0] = "%s:%s://%s:%s %s" % ( e.get("remote_addr", ""), e.get("wsgi_url_scheme", "http").lower(), host, e.get("request_method", "get").lower(), items[0], ) else: items[0] = ":http://localhost:get %s" % items[0] for (regex, value, tmp) in routes.routes_out: if regex.match(items[0]): rewritten = "?".join([regex.sub(value, items[0])] + items[1:]) log_rewrite("routes_out: [%s] -> %s" % (url, rewritten)) return rewritten log_rewrite("routes_out: [%s] not rewritten" % url) return url
[文档]def filter_url( url, method="get", remote="0.0.0.0", out=False, app=False, lang=None, domain=(None, None), env=False, scheme=None, host=None, port=None, language=None, ): """ doctest/unittest interface to regex_filter_in() and regex_filter_out() """ match = re.match( r"^(?P<scheme>http|https|HTTP|HTTPS)\://(?P<host>[^/]*)(?P<uri>.*)", url ) urlscheme = match.group("scheme").lower() urlhost = match.group("host").lower() uri = match.group("uri") k = uri.find("?") if k < 0: k = len(uri) if isinstance(domain, str): domain = (domain, None) (path_info, query_string) = (uri[:k], uri[k + 1 :]) path_info = urllib_unquote(path_info) # simulate server e = { "REMOTE_ADDR": remote, "REQUEST_METHOD": method, "wsgi.url_scheme": urlscheme, "HTTP_HOST": urlhost, "REQUEST_URI": uri, "PATH_INFO": path_info, "QUERY_STRING": query_string, # for filter_out request.env use lowercase "remote_addr": remote, "request_method": method, "wsgi_url_scheme": urlscheme, "http_host": urlhost, } request = Storage() e["applications_parent"] = global_settings.applications_parent request.env = Storage(e) request.uri_language = lang # determine application only # if app: if routers: return map_url_in(request, e, app=True) return regex_select(e) # rewrite outbound URL # if out: (request.env.domain_application, request.env.domain_controller) = domain items = path_info.lstrip("/").split("/") if items[-1] == "": items.pop() # adjust trailing empty args assert len(items) >= 3, "at least /a/c/f is required" a = items.pop(0) c = items.pop(0) f = items.pop(0) if not routers: return regex_filter_out(uri, e) acf = map_url_out( request, None, a, c, f, items, None, scheme, host, port, language=language ) if items: url = "%s/%s" % (acf, "/".join(items)) if items[-1] == "": url += "/" else: url = acf if query_string: url += "?" + query_string return url # rewrite inbound URL # (static, version, e) = url_in(request, e) if static: return static result = "/%s/%s/%s" % (request.application, request.controller, request.function) if request.extension and request.extension != "html": result += ".%s" % request.extension if request.args: result += " %s" % request.args if e["QUERY_STRING"]: result += " ?%s" % e["QUERY_STRING"] if request.uri_language: result += " (%s)" % request.uri_language if env: return request.env return result
[文档]def filter_err(status, application="app", ticket="tkt"): """doctest/unittest interface to routes_onerror""" routes = THREAD_LOCAL.routes if status > 399 and routes.routes_onerror: keys = set( ( "%s/%s" % (application, status), "%s/*" % (application), "*/%s" % (status), "*/*", ) ) for (key, redir) in routes.routes_onerror: if key in keys: if redir == "!": break elif "?" in redir: url = redir + "&" + "code=%s&ticket=%s" % (status, ticket) else: url = redir + "?" + "code=%s&ticket=%s" % (status, ticket) return url # redirection return status # no action
# router support #
[文档]class MapUrlIn(object): """Logic for mapping incoming URLs""" def __init__(self, request=None, env=None): """Initializes a map-in object""" self.request = request self.env = env self.router = None self.application = None self.language = None self.controller = None self.function = None self.extension = "html" self.controllers = set() self.functions = dict() self.languages = set() self.default_language = None self.map_hyphen = False self.exclusive_domain = False path = self.env["PATH_INFO"] self.query = self.env.get("QUERY_STRING", None) path = path.lstrip("/") self.env["PATH_INFO"] = "/" + path if self.query: self.env["WEB2PY_ORIGINAL_URI"] = "%s?%s" % ( self.env["PATH_INFO"], self.query, ) else: self.env["WEB2PY_ORIGINAL_URI"] = self.env["PATH_INFO"] # to handle empty args, strip exactly one trailing slash, if present # .../arg1// represents one trailing empty arg # if path.endswith("/"): path = path[:-1] self.args = List(path.split("/") if path else []) # see http://www.python.org/dev/peps/pep-3333/#url-reconstruction for URL composition self.remote_addr = self.env.get("REMOTE_ADDR", "localhost") self.scheme = self.env.get("wsgi.url_scheme", "http").lower() self.method = self.env.get("REQUEST_METHOD", "get").lower() (self.host, self.port) = (self.env.get("HTTP_HOST"), None) if not self.host: (self.host, self.port) = ( self.env.get("SERVER_NAME"), self.env.get("SERVER_PORT"), ) if not self.host: self.host = "localhost" self.port = "80" if ":" in self.host: (self.host, self.port) = self.host.rsplit(":", 1) # for ipv6 support if not self.port: self.port = "443" if self.scheme == "https" else "80"
[文档] def map_prefix(self): """Strips path prefix, if present in its entirety""" prefix = routers.BASE.path_prefix if prefix: prefixlen = len(prefix) if prefixlen > len(self.args): return for i in xrange(prefixlen): if prefix[i] != self.args[i]: return # prefix didn't match self.args = List(self.args[prefixlen:]) # strip the prefix
[文档] def map_app(self): """Determines application name""" base = routers.BASE # base router self.domain_application = None self.domain_controller = None self.domain_function = None self.map_hyphen = base.map_hyphen arg0 = self.harg0 if ( not base.exclusive_domain and base.applications and arg0 in base.applications ): self.application = arg0 elif not base.exclusive_domain and arg0 and not base.applications: self.application = arg0 elif (self.host, self.port) in base.domains: ( self.application, self.domain_controller, self.domain_function, ) = base.domains[(self.host, self.port)] self.env["domain_application"] = self.application self.env["domain_controller"] = self.domain_controller self.env["domain_function"] = self.domain_function elif (self.host, None) in base.domains: ( self.application, self.domain_controller, self.domain_function, ) = base.domains[(self.host, None)] self.env["domain_application"] = self.application self.env["domain_controller"] = self.domain_controller self.env["domain_function"] = self.domain_function elif base.applications and arg0 in base.applications: self.application = arg0 elif arg0 and not base.applications: self.application = arg0 else: self.application = base.default_application or "" self.pop_arg_if(self.application == arg0) if not base._acfe_match.match(self.application): raise HTTP( 400, THREAD_LOCAL.routes.error_message % "invalid request", web2py_error="invalid application: '%s'" % self.application, ) if self.application not in routers and ( self.application != THREAD_LOCAL.routes.default_application or self.application == "welcome" ): raise HTTP( 400, THREAD_LOCAL.routes.error_message % "invalid request", web2py_error="unknown application: '%s'" % self.application, ) # set the application router # log_rewrite("select application=%s" % self.application) self.request.application = self.application if self.application not in routers: self.router = routers.BASE # support gluon.main.wsgibase init->welcome else: self.router = routers[self.application] # application router self.controllers = self.router.controllers self.default_controller = ( self.domain_controller or self.router.default_controller ) self.functions = self.router.functions self.languages = self.router.languages self.default_language = self.router.default_language self.map_hyphen = self.router.map_hyphen self.exclusive_domain = self.router.exclusive_domain self._acfe_match = self.router._acfe_match self.file_match = self.router.file_match self._file_match = self.router._file_match self._args_match = self.router._args_match
[文档] def map_root_static(self): """ Handles root-static files (no hyphen mapping) a root-static file is one whose incoming URL expects it to be at the root, typically robots.txt & favicon.ico """ if len(self.args) == 1 and self.arg0 in self.router.root_static: self.controller = self.request.controller = "static" root_static_file = pjoin( global_settings.applications_parent, "applications", self.application, self.controller, self.arg0, ) log_rewrite("route: root static=%s" % root_static_file) return root_static_file, None return None, None
[文档] def map_language(self): """Handles language (no hyphen mapping)""" arg0 = self.arg0 # no hyphen mapping if arg0 and self.languages and arg0 in self.languages: self.language = arg0 else: self.language = self.default_language if self.language: log_rewrite("route: language=%s" % self.language) self.pop_arg_if(self.language == arg0) arg0 = self.arg0
[文档] def map_controller(self): """Identifies controller""" # handle controller # arg0 = self.harg0 # map hyphens if not arg0 or (self.controllers and arg0 not in self.controllers): self.controller = self.default_controller or "" else: self.controller = arg0 self.pop_arg_if(arg0 == self.controller) log_rewrite("route: controller=%s" % self.controller) if not self.router._acfe_match.match(self.controller): raise HTTP( 400, THREAD_LOCAL.routes.error_message % "invalid request", web2py_error="invalid controller", )
[文档] def map_static(self): """ Handles static files file_match but no hyphen mapping """ if self.controller != "static": return None, None version = REGEX_VERSION.match(self.args(0)) if self.args and version: file = "/".join(self.args[1:]) else: file = "/".join(self.args) if len(self.args) == 0: bad_static = True # require a file name elif "/" in self.file_match: # match the path bad_static = not self.router._file_match.match(file) else: # match path elements bad_static = False for name in self.args: bad_static = ( bad_static or name in ("", ".", "..") or not self.router._file_match.match(name) ) if bad_static: log_rewrite("bad static path=%s" % file) raise HTTP( 400, THREAD_LOCAL.routes.error_message % "invalid request", web2py_error="invalid static file", ) # # support language-specific static subdirectories, # eg /appname/en/static/filename => applications/appname/static/en/filename # if language-specific file doesn't exist, try same file in static # if self.language: static_file = pjoin( global_settings.applications_parent, "applications", self.application, "static", self.language, file, ) if not self.language or not isfile(static_file): static_file = pjoin( global_settings.applications_parent, "applications", self.application, "static", file, ) self.extension = None log_rewrite("route: static=%s" % static_file) return static_file, version
[文档] def map_function(self): """Handles function.extension""" arg0 = self.harg0 # map hyphens functions = self.functions.get(self.controller, set()) if isinstance(self.router.default_function, dict): default_function = self.router.default_function.get(self.controller, None) else: default_function = self.router.default_function # str or None default_function = self.domain_function or default_function if not arg0 or functions and arg0.split(".")[0] not in functions: self.function = default_function or "" self.pop_arg_if(arg0 and self.function == arg0) else: func_ext = arg0.split(".") if len(func_ext) > 1: self.function = func_ext[0] self.extension = func_ext[-1] else: self.function = arg0 self.pop_arg_if(True) log_rewrite("route: function.ext=%s.%s" % (self.function, self.extension)) if not self.router._acfe_match.match(self.function): raise HTTP( 400, THREAD_LOCAL.routes.error_message % "invalid request", web2py_error="invalid function", ) if self.extension and not self.router._acfe_match.match(self.extension): raise HTTP( 400, THREAD_LOCAL.routes.error_message % "invalid request", web2py_error="invalid extension", )
[文档] def validate_args(self): """ Checks args against validation pattern """ for arg in self.args: if not self.router._args_match.match(arg): raise HTTP( 400, THREAD_LOCAL.routes.error_message % "invalid request", web2py_error="invalid arg <%s>" % arg, )
[文档] def sluggify(self): self.request.env.update( (k.lower().replace(".", "_"), v) for k, v in iteritems(self.env) )
[文档] def update_request(self): """ Updates request from self Builds env.request_uri Makes lower-case versions of http headers in env """ self.request.application = self.application self.request.controller = self.controller self.request.function = self.function self.request.extension = self.extension self.request.args = self.args if self.language: self.request.uri_language = self.language uri = "/%s/%s" % (self.controller, self.function) app = self.application if self.map_hyphen: uri = uri.replace("_", "-") app = app.replace("_", "-") if self.extension and self.extension != "html": uri += "." + self.extension if self.language: uri = "/%s%s" % (self.language, uri) uri = "/%s%s%s%s" % ( app, uri, urllib_quote("/" + "/".join(str(x) for x in self.args)) if self.args else "", ("?" + self.query) if self.query else "", ) self.env["REQUEST_URI"] = uri self.sluggify()
@property def arg0(self): """Returns first arg""" return self.args(0) @property def harg0(self): """Returns first arg with optional hyphen mapping""" if self.map_hyphen and self.args(0): return self.args(0).replace("-", "_") return self.args(0)
[文档] def pop_arg_if(self, dopop): """Conditionally removes first arg and returns new first arg""" if dopop: self.args.pop(0)
[文档]class MapUrlOut(object): """Logic for mapping outgoing URLs""" def __init__( self, request, env, application, controller, function, args, other, scheme, host, port, language, ): """initialize a map-out object""" self.default_application = routers.BASE.default_application if application in routers: self.router = routers[application] else: self.router = routers.BASE self.request = request self.env = env self.application = application self.controller = controller self.is_static = controller == "static" or controller.startswith("static/") self.function = function self.args = args self.other = other self.scheme = scheme self.host = host self.port = port self.language = language self.applications = routers.BASE.applications self.controllers = self.router.controllers self.functions = self.router.functions.get(self.controller, set()) self.languages = self.router.languages self.default_language = self.router.default_language self.exclusive_domain = self.router.exclusive_domain self.map_hyphen = self.router.map_hyphen self.map_static = self.router.map_static self.path_prefix = routers.BASE.path_prefix self.domain_application = request and self.request.env.domain_application self.domain_controller = request and self.request.env.domain_controller if isinstance(self.router.default_function, dict): self.default_function = self.router.default_function.get( self.controller, None ) else: self.default_function = self.router.default_function if ( self.router.exclusive_domain and self.domain_application and self.domain_application != self.application and not self.host ): raise SyntaxError("cross-domain conflict: must specify host") lang = self.language if self.language else request and request.uri_language if lang and self.languages and lang in self.languages: self.language = lang else: self.language = None self.omit_application = False self.omit_language = False self.omit_controller = False self.omit_function = False
[文档] def omit_lang(self): """Omits language if possible""" if not self.language or self.language == self.default_language: self.omit_language = True
[文档] def omit_acf(self): """Omits what we can of a/c/f""" router = self.router # Handle the easy no-args case of tail-defaults: /a/c /a / # if not self.args and self.function == self.default_function: self.omit_function = True if self.controller == router.default_controller: self.omit_controller = True if self.application == self.default_application: self.omit_application = True # omit default application # (which might be the domain default application) # default_application = self.domain_application or self.default_application if self.application == default_application: self.omit_application = True # omit controller if default controller # default_controller = ( ((self.application == self.domain_application) and self.domain_controller) or router.default_controller or "" ) if self.controller == default_controller: self.omit_controller = True # omit function if possible # if ( self.functions and self.function in self.functions and self.function == self.default_function ): self.omit_function = True # prohibit ambiguous cases # # because we presume the lang string to be unambiguous, its presence protects application omission # if self.exclusive_domain: applications = [self.domain_application] else: applications = self.applications if self.omit_language: if not applications or self.controller in applications: self.omit_application = False if self.omit_application: if not applications or self.function in applications: self.omit_controller = False if not self.controllers or self.function in self.controllers: self.omit_controller = False if self.args: if ( self.args[0] in self.functions or self.args[0] in self.controllers or self.args[0] in applications ): self.omit_function = False if self.omit_controller: if self.function in self.controllers or self.function in applications: self.omit_controller = False if self.omit_application: if self.controller in applications: self.omit_application = False # handle static as a special case # (easier for external static handling) # if self.is_static: if not self.map_static: self.omit_application = False if self.language: self.omit_language = False self.omit_controller = False self.omit_function = False
[文档] def build_acf(self): "Builds a/c/f from components" acf = "" if self.map_hyphen: self.controller = self.controller.replace("_", "-") if self.controller != "static" and not self.controller.startswith( "static/" ): self.application = self.application.replace("_", "-") self.function = self.function.replace("_", "-") if not self.omit_application: acf += "/" + self.application # handle case of flipping lang/static/file to static/lang/file for external rewrite if self.is_static and self.map_static is False and not self.omit_language: acf += "/" + self.controller + "/" + self.language else: if not self.omit_language: acf += "/" + self.language if not self.omit_controller: acf += "/" + self.controller if not self.omit_function: acf += "/" + self.function if self.path_prefix: acf = "/" + "/".join(self.path_prefix) + acf if self.args: return acf return acf or "/"
[文档] def acf(self): """Converts components to /app/lang/controller/function""" if not routers: return None # use regex filter self.omit_lang() # try to omit language self.omit_acf() # try to omit a/c/f return self.build_acf() # build and return the /a/lang/c/f string
[文档]def map_url_in(request, env, app=False): """Routes incoming URL""" # initialize router-url object # THREAD_LOCAL.routes = params # default to base routes map = MapUrlIn(request=request, env=env) map.sluggify() map.map_prefix() # strip prefix if present map.map_app() # determine application # configure THREAD_LOCAL.routes for error rewrite # if params.routes_app: THREAD_LOCAL.routes = params_apps.get(app, params) if app: return map.application root_static_file, version = map.map_root_static() # handle root-static files if root_static_file: map.update_request() return (root_static_file, version, map.env) # handle mapping of lang/static to static/lang in externally-rewritten URLs # in case we have to handle them ourselves if ( map.languages and map.map_static is False and map.arg0 == "static" and map.args(1) in map.languages ): map.map_controller() map.map_language() else: map.map_language() map.map_controller() static_file, version = map.map_static() if static_file: map.update_request() return (static_file, version, map.env) map.map_function() map.validate_args() map.update_request() return (None, None, map.env)
[文档]def map_url_out( request, env, application, controller, function, args, other, scheme, host, port, language=None, ): """ Supply /a/c/f (or /a/lang/c/f) portion of outgoing url The basic rule is that we can only make transformations that map_url_in can reverse. Suppose that the incoming arguments are a,c,f,args,lang and that the router defaults are da, dc, df, dl. We can perform these transformations trivially if args=[] and lang=None or dl:: /da/dc/df => / /a/dc/df => /a /a/c/df => /a/c We would also like to be able to strip the default application or application/controller from URLs with function/args present, thus:: /da/c/f/args => /c/f/args /da/dc/f/args => /f/args We use [applications] and [controllers] and {functions} to suppress ambiguous omissions. We assume that language names do not collide with a/c/f names. """ map = MapUrlOut( request, env, application, controller, function, args, other, scheme, host, port, language, ) return map.acf()
[文档]def get_effective_router(appname): """Returns a private copy of the effective router for the specified application""" if not routers or appname not in routers: return None return Storage(routers[appname]) # return a copy