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#!/usr/bin/python
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#
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# CGI script to handle file updates for the rpms CVS repository. There
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# is nothing really complex here other than tedious checking of our
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# every step along the way...
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#
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# Written for Fedora, modified to suit CentOS Infrastructure.
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# Modified by Howard Johnson <merlin@merlinthp.org> 2014
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#
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# License: GPL
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#
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# centos' lookaside is a bit differently laid out to fedora's.
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# centos uses a <package>/<branch>/<sha1sum> scheme.
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#
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# The upload.cgi gets called with the following arguments:
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#   name - package (git repo) name
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#   branch - branch name
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#   sha1sum - SHA1 checksum of the file
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#   file - the file to upload (optional)
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#
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# With only the first three args, the script runs in check mode.
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# With the fourth too, it operates in upload mode.
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#
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import os
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import sys
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import cgi
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import tempfile
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import syslog
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import smtplib
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import re
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from ConfigParser import SafeConfigParser
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from email import Header, Utils
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try:
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    from email.mime.text import MIMEText
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except ImportError:
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    from email.MIMEText import MIMEText
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import hashlib
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sha1_constructor = hashlib.sha1
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# Config file with all our settings
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CONFIG = '/etc/lookaside.cfg'
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conf = SafeConfigParser()
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conf.read(CONFIG)
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# Reading buffer size
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BUFFER_SIZE = 4096
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# Gitblit config file regexes
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SECTION = re.compile(r'\[(.+)\]')
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OPTION = re.compile(r'(.+)=(.+)')
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REPO = re.compile(r'([^/]+).git$')
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def merge_gitblit_section(repoacl, repos, users):
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    for repo in repos:
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        if repo not in repoacl:
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            repoacl[repo] = []
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        for user in users:
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            if user not in repoacl[repo]:
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                repoacl[repo].append(user)
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# turns the gitblit config file into a dict of package name to permitted users
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def parse_gitblit_config(filename):
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    insection = False
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    repoacl = {}
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    sectrepos = []
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    sectusers = []
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    f = open(filename)
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    for line in f:
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        if line.strip() == '' or line[0] == '#':
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            continue
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        secth = SECTION.match(line)
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        if secth:
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            if insection:
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                merge_gitblit_section(repoacl, sectrepos, sectusers)
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                sectrepos = []
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                sectusers = []
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            else:
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                insection = True
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            continue
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        opt = OPTION.match(line)
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        if opt:
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            if not insection:
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                continue
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            key = opt.group(1).strip()
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            value = opt.group(2).strip()
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            if key == "repository":
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                pack = REPO.search(value)
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                if pack:
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                    sectrepos.append(pack.group(1))
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            elif key == "user":
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                sectusers.append(value)
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    if insection:
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        merge_gitblit_section(repoacl, sectrepos, sectusers)
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    f.close()
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    return repoacl
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def send_error(text):
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    print text
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    sys.exit(1)
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def check_form(form, var):
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    ret = form.getvalue(var, None)
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    if ret is None:
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        send_error('Required field "%s" is not present.' % var)
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    if isinstance(ret, list):
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        send_error('Multiple values given for "%s". Aborting.' % var)
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    return ret
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def send_email(pkg, sha1, filename, username):
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    text = """A file has been added to the lookaside cache for %(pkg)s:
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%(sha1)s  %(filename)s""" % locals()
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    msg = MIMEText(text)
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    sender_name = conf.get('mail', 'sender_name')
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    sender_email = conf.get('mail', 'sender_email')
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    sender = Utils.formataddr((sender_name, sender_email))
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    recipient = conf.get('mail', 'recipient')
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    msg['Subject'] = 'File %s uploaded to lookaside cache by %s' % (
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            filename, username)
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    msg['From'] = sender
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    msg['To'] = recipient
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    try:
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        s = smtplib.SMTP(conf.get('mail', 'smtp_server'))
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        s.sendmail(sender, recipient, msg.as_string())
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    except:
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        errstr = 'sending mail for upload of %s failed!' % filename
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        print >> sys.stderr, errstr
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        syslog.syslog(errstr)
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def main():
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    os.umask(002)
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    username = os.environ.get('SSL_CLIENT_S_DN_CN', None)
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    print 'Content-Type: text/plain'
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    print
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    assert os.environ['REQUEST_URI'].split('/')[1] == 'lookaside'
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    form = cgi.FieldStorage()
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    name = check_form(form, 'name')
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    branch = check_form(form, 'branch')
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    sha1sum = check_form(form, 'sha1sum')
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    action = None
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    upload_file = None
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    filename = None
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    # Is this a submission or a test?
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    # in a test, we don't get a file.
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    if not form.has_key('file'):
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        action = 'check'
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        print >> sys.stderr, '[username=%s] Checking file status: NAME=%s BRANCH=%s SHA1SUM=%s' % (username, name, branch, sha1sum)
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    else:
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        action = 'upload'
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        upload_file = form['file']
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        if not upload_file.file:
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            send_error('No file given for upload. Aborting.')
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        filename = os.path.basename(upload_file.filename)
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        print >> sys.stderr, '[username=%s] Processing upload request: NAME=%s BRANCH=%s SHA1SUM=%s' % (username, name, branch, sha1sum)
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    module_dir = os.path.join(conf.get('lookaside', 'cache_dir'), name, branch)
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    dest_file =  os.path.join(module_dir, sha1sum)
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    # try to see if we already have this file...
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    if os.path.exists(dest_file):
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        if action == 'check':
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            print 'Available'
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        else:
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            upload_file.file.close()
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            dest_file_stat = os.stat(dest_file)
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            print 'File %s already exists' % filename
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            print 'File: %s Size: %d' % (dest_file, dest_file_stat.st_size)
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        sys.exit(0)
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    elif action == 'check':
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        print 'Missing'
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        sys.exit(0)
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    # if desired, make sure the user has permission to write to this branch
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    if conf.getboolean('acl', 'do_acl'):
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        # load in the gitblit config
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        repoacl = parse_gitblit_config(conf.get('acl', 'gitblit_config'))
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        # if the package isn't in the gitblit config, we can't give upload perms
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        if name not in repoacl:
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            send_error("Unknown package %s" % name)
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        # now check the perms
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        if username not in repoacl[name]:
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            send_error("Write access package %s rejected for user %s" % (name, username))
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    # check that all directories are in place
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    if not os.path.isdir(module_dir):
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        os.makedirs(module_dir, 02775)
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    # grab a temporary filename and dump our file in there
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    tempfile.tempdir = module_dir
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    tmpfile = tempfile.mkstemp(sha1sum)[1]
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    tmpfd = open(tmpfile, 'w')
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    # now read the whole file in
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    m = sha1_constructor()
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    filesize = 0
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    while True:
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        data = upload_file.file.read(BUFFER_SIZE)
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        if not data:
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            break
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        tmpfd.write(data)
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        m.update(data)
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        filesize += len(data)
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    # now we're done reading, check the MD5 sum of what we got
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    tmpfd.close()
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    check_sha1sum = m.hexdigest()
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    if sha1sum != check_sha1sum:
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        os.unlink(tmpfile)
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        send_error("SHA1 check failed. Received %s instead of %s." % (check_sha1sum, sha1sum))
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    # rename it its final name
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    os.rename(tmpfile, dest_file)
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    os.chmod(dest_file, 0644)
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    print >> sys.stderr, '[username=%s] Stored %s (%d bytes)' % (username, dest_file, filesize)
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    print 'File %s size %d SHA1 %s stored OK' % (filename, filesize, sha1sum)
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    if conf.getboolean('mail', 'send_mail'):
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        send_email(name, sha1sum, filename, username)
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if __name__ == '__main__':
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    main()