mercurial/hgweb/protocol.py

#
# 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 cStringIO, zlib, bz2, tempfile, errno, os, sys
from mercurial import util, streamclone
from mercurial.i18n import gettext as _
from mercurial.node import bin, hex
from mercurial import changegroup as changegroupmod
from common import HTTP_OK, HTTP_NOT_FOUND, HTTP_SERVER_ERROR

# __all__ is populated with the allowed commands. Be sure to add to it if
# you're adding a new command, or the new command won't work.

__all__ = [
   'lookup', 'heads', 'branches', 'between', 'changegroup',
   'changegroupsubset', 'capabilities', 'unbundle', 'stream_out',
]

HGTYPE = 'application/mercurial-0.1'

def lookup(web, req):
    try:
        r = hex(web.repo.lookup(req.form['key'][0]))
        success = 1
    except Exception,inst:
        r = str(inst)
        success = 0
    resp = "%s %s\n" % (success, r)
    req.respond(HTTP_OK, HGTYPE, length=len(resp))
    req.write(resp)

def heads(web, req):
    resp = " ".join(map(hex, web.repo.heads())) + "\n"
    req.respond(HTTP_OK, HGTYPE, length=len(resp))
    req.write(resp)

def branches(web, req):
    nodes = []
    if 'nodes' in req.form:
        nodes = map(bin, req.form['nodes'][0].split(" "))
    resp = cStringIO.StringIO()
    for b in web.repo.branches(nodes):
        resp.write(" ".join(map(hex, b)) + "\n")
    resp = resp.getvalue()
    req.respond(HTTP_OK, HGTYPE, length=len(resp))
    req.write(resp)

def between(web, req):
    if 'pairs' in req.form:
        pairs = [map(bin, p.split("-"))
                 for p in req.form['pairs'][0].split(" ")]
    resp = cStringIO.StringIO()
    for b in web.repo.between(pairs):
        resp.write(" ".join(map(hex, b)) + "\n")
    resp = resp.getvalue()
    req.respond(HTTP_OK, HGTYPE, length=len(resp))
    req.write(resp)

def changegroup(web, req):
    req.respond(HTTP_OK, HGTYPE)
    nodes = []
    if not web.allowpull:
        return

    if 'roots' in req.form:
        nodes = map(bin, req.form['roots'][0].split(" "))

    z = zlib.compressobj()
    f = web.repo.changegroup(nodes, 'serve')
    while 1:
        chunk = f.read(4096)
        if not chunk:
            break
        req.write(z.compress(chunk))

    req.write(z.flush())

def changegroupsubset(web, req):
    req.respond(HTTP_OK, HGTYPE)
    bases = []
    heads = []
    if not web.allowpull:
        return

    if 'bases' in req.form:
        bases = [bin(x) for x in req.form['bases'][0].split(' ')]
    if 'heads' in req.form:
        heads = [bin(x) for x in req.form['heads'][0].split(' ')]

    z = zlib.compressobj()
    f = web.repo.changegroupsubset(bases, heads, 'serve')
    while 1:
        chunk = f.read(4096)
        if not chunk:
            break
        req.write(z.compress(chunk))

    req.write(z.flush())

def capabilities(web, req):
    resp = ' '.join(web.capabilities())
    req.respond(HTTP_OK, HGTYPE, length=len(resp))
    req.write(resp)

def unbundle(web, req):
    def bail(response, headers={}):
        length = int(req.env['CONTENT_LENGTH'])
        for s in util.filechunkiter(req, limit=length):
            # drain incoming bundle, else client will not see
            # response when run outside cgi script
            pass
        req.header(headers.items())
        req.respond(HTTP_OK, HGTYPE)
        req.write('0\n')
        req.write(response)

    # require ssl by default, auth info cannot be sniffed and
    # replayed
    ssl_req = web.configbool('web', 'push_ssl', True)
    if ssl_req:
        if req.env.get('wsgi.url_scheme') != 'https':
            bail('ssl required\n')
            return
        proto = 'https'
    else:
        proto = 'http'

    # do not allow push unless explicitly allowed
    if not web.check_perm(req, 'push', False):
        bail('push not authorized\n',
             headers={'status': '401 Unauthorized'})
        return

    their_heads = req.form['heads'][0].split(' ')

    def check_heads():
        heads = map(hex, web.repo.heads())
        return their_heads == [hex('force')] or their_heads == heads

    # fail early if possible
    if not check_heads():
        bail('unsynced changes\n')
        return

    req.respond(HTTP_OK, HGTYPE)

    # do not lock repo until all changegroup data is
    # streamed. save to temporary file.

    fd, tempname = tempfile.mkstemp(prefix='hg-unbundle-')
    fp = os.fdopen(fd, 'wb+')
    try:
        length = int(req.env['CONTENT_LENGTH'])
        for s in util.filechunkiter(req, limit=length):
            fp.write(s)

        try:
            lock = web.repo.lock()
            try:
                if not check_heads():
                    req.write('0\n')
                    req.write('unsynced changes\n')
                    return

                fp.seek(0)
                header = fp.read(6)
                if header.startswith('HG') and not header.startswith('HG10'):
                    raise ValueError('unknown bundle version')
                elif header not in changegroupmod.bundletypes:
                    raise ValueError('unknown bundle compression type')
                gen = changegroupmod.unbundle(header, fp)

                # send addchangegroup output to client

                old_stdout = sys.stdout
                sys.stdout = cStringIO.StringIO()

                try:
                    url = 'remote:%s:%s' % (proto,
                                            req.env.get('REMOTE_HOST', ''))
                    try:
                        ret = web.repo.addchangegroup(gen, 'serve', url)
                    except util.Abort, inst:
                        sys.stdout.write("abort: %s\n" % inst)
                        ret = 0
                finally:
                    val = sys.stdout.getvalue()
                    sys.stdout = old_stdout
                req.write('%d\n' % ret)
                req.write(val)
            finally:
                del lock
        except ValueError, inst:
            req.write('0\n')
            req.write(str(inst) + '\n')
        except (OSError, IOError), inst:
            req.write('0\n')
            filename = getattr(inst, 'filename', '')
            # Don't send our filesystem layout to the client
            if filename.startswith(web.repo.root):
                filename = filename[len(web.repo.root)+1:]
            else:
                filename = ''
            error = getattr(inst, 'strerror', 'Unknown error')
            if inst.errno == errno.ENOENT:
                code = HTTP_NOT_FOUND
            else:
                code = HTTP_SERVER_ERROR
            req.respond(code)
            req.write('%s: %s\n' % (error, filename))
    finally:
        fp.close()
        os.unlink(tempname)

def stream_out(web, req):
    req.respond(HTTP_OK, HGTYPE)
    streamclone.stream_out(web.repo, req, untrusted=True)