hgweb: use the parsed application path directly

hgweb: use the parsed application path directly

Previously, we assigned a custom system string with a trailing slash
to wsgirequest.url.

The addition of the trailing slash felt arbitrary and seems to go
against how things typically work in WSGI.

We also want our URLs to be bytes, not system strings.

And, assigning a custom attribute to wsgirequest felt wrong.

This commit fixes all those things by removing the trailing
slash from the app path, changing consumers to use that variable
and to use it without a trailing slash, and removing the custom
attribute from wsgirequest.

We preserve the trailing slash on {url}. Also, makebreadcrumb
strips the trailing slash. So no change to it was needed.

Differential Revision: https://phab.mercurial-scm.org/D2736

--- a/mercurial/hgweb/hgweb_mod.py	Thu Mar 08 12:59:25 2018 -0800
+++ b/mercurial/hgweb/hgweb_mod.py	Thu Mar 08 15:08:20 2018 -0800
@@ -148,7 +148,7 @@
         logourl = self.config('web', 'logourl')
         logoimg = self.config('web', 'logoimg')
         staticurl = (self.config('web', 'staticurl')
-                     or pycompat.sysbytes(wsgireq.url) + 'static/')
+                     or req.apppath + '/static/')
         if not staticurl.endswith('/'):
             staticurl += '/'
 
@@ -170,7 +170,7 @@
         if not self.reponame:
             self.reponame = (self.config('web', 'name', '')
                              or wsgireq.env.get('REPO_NAME')
-                             or wsgireq.url.strip(r'/') or self.repo.root)
+                             or req.apppath or self.repo.root)
 
         def websubfilter(text):
             return templatefilters.websub(text, self.websubtable)
@@ -178,7 +178,7 @@
         # create the templater
         # TODO: export all keywords: defaults = templatekw.keywords.copy()
         defaults = {
-            'url': pycompat.sysbytes(wsgireq.url),
+            'url': req.apppath + '/',
             'logourl': logourl,
             'logoimg': logoimg,
             'staticurl': staticurl,
@@ -187,7 +187,7 @@
             'encoding': encoding.encoding,
             'motd': motd,
             'sessionvars': sessionvars,
-            'pathdef': makebreadcrumb(pycompat.sysbytes(wsgireq.url)),
+            'pathdef': makebreadcrumb(req.apppath),
             'style': style,
             'nonce': self.nonce,
         }
@@ -318,8 +318,6 @@
                                if h[0] != 'Content-Security-Policy']
             wsgireq.headers.append(('Content-Security-Policy', rctx.csp))
 
-        wsgireq.url = pycompat.sysstr(req.apppath)
-
         if r'PATH_INFO' in wsgireq.env:
             parts = wsgireq.env[r'PATH_INFO'].strip(r'/').split(r'/')
             repo_parts = wsgireq.env.get(r'REPO_NAME', r'').split(r'/')

--- a/mercurial/hgweb/request.py	Thu Mar 08 12:59:25 2018 -0800
+++ b/mercurial/hgweb/request.py	Thu Mar 08 15:08:20 2018 -0800
@@ -146,14 +146,13 @@
     # root. We also exclude its path components from PATH_INFO when resolving
     # the dispatch path.
 
-    # TODO the use of trailing slashes in apppath is arguably wrong. We need it
-    # to appease low-level parts of hgweb_mod for now.
     apppath = env['SCRIPT_NAME']
-    if not apppath.endswith('/'):
-        apppath += '/'
 
     if env.get('REPO_NAME'):
-        apppath += env.get('REPO_NAME') + '/'
+        if not apppath.endswith('/'):
+            apppath += '/'
+
+        apppath += env.get('REPO_NAME')
 
     if 'PATH_INFO' in env:
         dispatchparts = env['PATH_INFO'].strip('/').split('/')