annotate mercurial/hgweb/hgweb_mod.py @ 6945:2cfdabe235fb

hgweb: return content iterator instead of using write() callable

This is a new version of 4879468fa28f (which was backed out in 943f066c0d58),
with an extra line removed to fix problems with hg serve. hg's internal web
server contains checking if the app isn't trying to write more bytes than
specified by the Content-Length header. The first try still contained an old
line that wrote the response, so the response was sent twice.

# hgweb/hgweb_mod.py - Web interface for a repository.
#
# Copyright 21 May 2005 - (c) 2005 Jake Edge <[e-mail]>
# Copyright 2005-2007 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

import os, mimetypes
from mercurial.node import hex, nullid
from mercurial.repo import RepoError
from mercurial import mdiff, ui, hg, util, patch, hook
from mercurial import revlog, templater, templatefilters
from common import get_mtime, style_map, paritygen, countgen, ErrorResponse
from common import HTTP_OK, HTTP_BAD_REQUEST, HTTP_NOT_FOUND, HTTP_SERVER_ERROR
from common import HTTP_UNAUTHORIZED, HTTP_METHOD_NOT_ALLOWED
from request import wsgirequest
import webcommands, protocol, webutil

perms = {
    'changegroup': 'pull',
    'changegroupsubset': 'pull',
    'unbundle': 'push',
    'stream_out': 'pull',
}

class hgweb(object):
    def __init__(self, repo, name=None):
        if isinstance(repo, str):
            parentui = ui.ui(report_untrusted=False, interactive=False)
            self.repo = hg.repository(parentui, repo)
        else:
            self.repo = repo

        hook.redirect(True)
        self.mtime = -1
        self.reponame = name
        self.archives = 'zip', 'gz', 'bz2'
        self.stripecount = 1
        # a repo owner may set web.templates in .hg/hgrc to get any file
        # readable by the user running the CGI script
        self.templatepath = self.config("web", "templates",
                                        templater.templatepath(),
                                        untrusted=False)

    # The CGI scripts are often run by a user different from the repo owner.
    # Trust the settings from the .hg/hgrc files by default.
    def config(self, section, name, default=None, untrusted=True):
        return self.repo.ui.config(section, name, default,
                                   untrusted=untrusted)

    def configbool(self, section, name, default=False, untrusted=True):
        return self.repo.ui.configbool(section, name, default,
                                       untrusted=untrusted)

    def configlist(self, section, name, default=None, untrusted=True):
        return self.repo.ui.configlist(section, name, default,
                                       untrusted=untrusted)

    def refresh(self):
        mtime = get_mtime(self.repo.root)
        if mtime != self.mtime:
            self.mtime = mtime
            self.repo = hg.repository(self.repo.ui, self.repo.root)
            self.maxchanges = int(self.config("web", "maxchanges", 10))
            self.stripecount = int(self.config("web", "stripes", 1))
            self.maxshortchanges = int(self.config("web", "maxshortchanges", 60))
            self.maxfiles = int(self.config("web", "maxfiles", 10))
            self.allowpull = self.configbool("web", "allowpull", True)
            self.encoding = self.config("web", "encoding", util._encoding)

    def run(self):
        if not os.environ.get('GATEWAY_INTERFACE', '').startswith("CGI/1."):
            raise RuntimeError("This function is only intended to be called while running as a CGI script.")
        import mercurial.hgweb.wsgicgi as wsgicgi
        wsgicgi.launch(self)

    def __call__(self, env, respond):
        req = wsgirequest(env, respond)
        return self.run_wsgi(req)

    def run_wsgi(self, req):

        self.refresh()

        # process this if it's a protocol request
        # protocol bits don't need to create any URLs
        # and the clients always use the old URL structure

        cmd = req.form.get('cmd', [''])[0]
        if cmd and cmd in protocol.__all__:
            try:
                if cmd in perms:
                    self.check_perm(req, perms[cmd])
                method = getattr(protocol, cmd)
                return method(self.repo, req)
            except ErrorResponse, inst:
                req.respond(inst.code, protocol.HGTYPE)
                if not inst.message:
                    return []
                return '0\n%s\n' % inst.message,

        # work with CGI variables to create coherent structure
        # use SCRIPT_NAME, PATH_INFO and QUERY_STRING as well as our REPO_NAME

        req.url = req.env['SCRIPT_NAME']
        if not req.url.endswith('/'):
            req.url += '/'
        if 'REPO_NAME' in req.env:
            req.url += req.env['REPO_NAME'] + '/'

        if 'PATH_INFO' in req.env:
            parts = req.env['PATH_INFO'].strip('/').split('/')
            repo_parts = req.env.get('REPO_NAME', '').split('/')
            if parts[:len(repo_parts)] == repo_parts:
                parts = parts[len(repo_parts):]
            query = '/'.join(parts)
        else:
            query = req.env['QUERY_STRING'].split('&', 1)[0]
            query = query.split(';', 1)[0]

        # translate user-visible url structure to internal structure

        args = query.split('/', 2)
        if 'cmd' not in req.form and args and args[0]:

            cmd = args.pop(0)
            style = cmd.rfind('-')
            if style != -1:
                req.form['style'] = [cmd[:style]]
                cmd = cmd[style+1:]

            # avoid accepting e.g. style parameter as command
            if hasattr(webcommands, cmd):
                req.form['cmd'] = [cmd]
            else:
                cmd = ''

            if args and args[0]:
                node = args.pop(0)
                req.form['node'] = [node]
            if args:
                req.form['file'] = args

            if cmd == 'static':
                req.form['file'] = req.form['node']
            elif cmd == 'archive':
                fn = req.form['node'][0]
                for type_, spec in self.archive_specs.iteritems():
                    ext = spec[2]
                    if fn.endswith(ext):
                        req.form['node'] = [fn[:-len(ext)]]
                        req.form['type'] = [type_]

        # process the web interface request

        try:

            tmpl = self.templater(req)
            ctype = tmpl('mimetype', encoding=self.encoding)
            ctype = templater.stringify(ctype)

            if cmd == '':
                req.form['cmd'] = [tmpl.cache['default']]
                cmd = req.form['cmd'][0]

            if cmd not in webcommands.__all__:
                msg = 'no such method: %s' % cmd
                raise ErrorResponse(HTTP_BAD_REQUEST, msg)
            elif cmd == 'file' and 'raw' in req.form.get('style', []):
                self.ctype = ctype
                content = webcommands.rawfile(self, req, tmpl)
            else:
                content = getattr(webcommands, cmd)(self, req, tmpl)
                req.respond(HTTP_OK, ctype)

            return ''.join(content),

        except revlog.LookupError, err:
            req.respond(HTTP_NOT_FOUND, ctype)
            msg = str(err)
            if 'manifest' not in msg:
                msg = 'revision not found: %s' % err.name
            return ''.join(tmpl('error', error=msg)),
        except (RepoError, revlog.RevlogError), inst:
            req.respond(HTTP_SERVER_ERROR, ctype)
            return ''.join(tmpl('error', error=str(inst))),
        except ErrorResponse, inst:
            req.respond(inst.code, ctype)
            return ''.join(tmpl('error', error=inst.message)),

    def templater(self, req):

        # determine scheme, port and server name
        # this is needed to create absolute urls

        proto = req.env.get('wsgi.url_scheme')
        if proto == 'https':
            proto = 'https'
            default_port = "443"
        else:
            proto = 'http'
            default_port = "80"

        port = req.env["SERVER_PORT"]
        port = port != default_port and (":" + port) or ""
        urlbase = '%s://%s%s' % (proto, req.env['SERVER_NAME'], port)
        staticurl = self.config("web", "staticurl") or req.url + 'static/'
        if not staticurl.endswith('/'):
            staticurl += '/'

        # some functions for the templater

        def header(**map):
            yield tmpl('header', encoding=self.encoding, **map)

        def footer(**map):
            yield tmpl("footer", **map)

        def motd(**map):
            yield self.config("web", "motd", "")

        def sessionvars(**map):
            fields = []
            if 'style' in req.form:
                style = req.form['style'][0]
                if style != self.config('web', 'style', ''):
                    fields.append(('style', style))

            separator = req.url[-1] == '?' and ';' or '?'
            for name, value in fields:
                yield dict(name=name, value=value, separator=separator)
                separator = ';'

        # figure out which style to use

        style = self.config("web", "style", "")
        if 'style' in req.form:
            style = req.form['style'][0]
        mapfile = style_map(self.templatepath, style)

        if not self.reponame:
            self.reponame = (self.config("web", "name")
                             or req.env.get('REPO_NAME')
                             or req.url.strip('/') or self.repo.root)

        # create the templater

        tmpl = templater.templater(mapfile, templatefilters.filters,
                                   defaults={"url": req.url,
                                             "staticurl": staticurl,
                                             "urlbase": urlbase,
                                             "repo": self.reponame,
                                             "header": header,
                                             "footer": footer,
                                             "motd": motd,
                                             "sessionvars": sessionvars
                                            })
        return tmpl

    def archivelist(self, nodeid):
        allowed = self.configlist("web", "allow_archive")
        for i, spec in self.archive_specs.iteritems():
            if i in allowed or self.configbool("web", "allow" + i):
                yield {"type" : i, "extension" : spec[2], "node" : nodeid}

    def listfilediffs(self, tmpl, files, changeset):
        for f in files[:self.maxfiles]:
            yield tmpl("filedifflink", node=hex(changeset), file=f)
        if len(files) > self.maxfiles:
            yield tmpl("fileellipses")

    def diff(self, tmpl, node1, node2, files):
        def filterfiles(filters, files):
            l = [x for x in files if x in filters]

            for t in filters:
                if t and t[-1] != os.sep:
                    t += os.sep
                l += [x for x in files if x.startswith(t)]
            return l

        parity = paritygen(self.stripecount)
        def diffblock(diff, f, fn):
            yield tmpl("diffblock",
                       lines=prettyprintlines(diff),
                       parity=parity.next(),
                       file=f,
                       filenode=hex(fn or nullid))

        blockcount = countgen()
        def prettyprintlines(diff):
            blockno = blockcount.next()
            for lineno, l in enumerate(diff.splitlines(1)):
                if blockno == 0:
                    lineno = lineno + 1
                else:
                    lineno = "%d.%d" % (blockno, lineno + 1)
                if l.startswith('+'):
                    ltype = "difflineplus"
                elif l.startswith('-'):
                    ltype = "difflineminus"
                elif l.startswith('@'):
                    ltype = "difflineat"
                else:
                    ltype = "diffline"
                yield tmpl(ltype,
                           line=l,
                           lineid="l%s" % lineno,
                           linenumber="% 8s" % lineno)

        r = self.repo
        c1 = r[node1]
        c2 = r[node2]
        date1 = util.datestr(c1.date())
        date2 = util.datestr(c2.date())

        modified, added, removed, deleted, unknown = r.status(node1, node2)[:5]
        if files:
            modified, added, removed = map(lambda x: filterfiles(files, x),
                                           (modified, added, removed))

        diffopts = patch.diffopts(self.repo.ui, untrusted=True)
        for f in modified:
            to = c1.filectx(f).data()
            tn = c2.filectx(f).data()
            yield diffblock(mdiff.unidiff(to, date1, tn, date2, f, f,
                                          opts=diffopts), f, tn)
        for f in added:
            to = None
            tn = c2.filectx(f).data()
            yield diffblock(mdiff.unidiff(to, date1, tn, date2, f, f,
                                          opts=diffopts), f, tn)
        for f in removed:
            to = c1.filectx(f).data()
            tn = None
            yield diffblock(mdiff.unidiff(to, date1, tn, date2, f, f,
                                          opts=diffopts), f, tn)

    archive_specs = {
        'bz2': ('application/x-tar', 'tbz2', '.tar.bz2', None),
        'gz': ('application/x-tar', 'tgz', '.tar.gz', None),
        'zip': ('application/zip', 'zip', '.zip', None),
        }

    def check_perm(self, req, op):
        '''Check permission for operation based on request data (including
        authentication info. Return true if op allowed, else false.'''

        if op == 'pull' and not self.allowpull:
            raise ErrorResponse(HTTP_OK, '')
        elif op == 'pull':
            return

        # enforce that you can only push using POST requests
        if req.env['REQUEST_METHOD'] != 'POST':
            msg = 'push requires POST request'
            raise ErrorResponse(HTTP_METHOD_NOT_ALLOWED, msg)

        # require ssl by default for pushing, auth info cannot be sniffed
        # and replayed
        scheme = req.env.get('wsgi.url_scheme')
        if self.configbool('web', 'push_ssl', True) and scheme != 'https':
            raise ErrorResponse(HTTP_OK, 'ssl required')

        user = req.env.get('REMOTE_USER')

        deny = self.configlist('web', 'deny_push')
        if deny and (not user or deny == ['*'] or user in deny):
            raise ErrorResponse(HTTP_UNAUTHORIZED, 'push not authorized')

        allow = self.configlist('web', 'allow_push')
        result = allow and (allow == ['*'] or user in allow)
        if not result:
            raise ErrorResponse(HTTP_UNAUTHORIZED, 'push not authorized')