1 # -*- coding: iso-8859-1 -*- 2 """ 3 MoinMoin - PostMessage Action 4 5 @copyright: 2012 by Paul Boddie <paul@boddie.org.uk> 6 @license: GNU GPL (v2 or later), see COPYING.txt for details. 7 """ 8 9 from MoinMoin.PageEditor import PageEditor 10 from MoinSupport import * 11 from email.parser import Parser 12 import os 13 14 try: 15 from cStringIO import StringIO 16 except ImportError: 17 from StringIO import StringIO 18 19 Dependencies = ['pages'] 20 21 class PostMessage: 22 23 "A posted message handler." 24 25 def __init__(self, pagename, request): 26 27 """ 28 On the page with the given 'pagename', use the given 'request' when 29 reading posted messages, modifying the Wiki. 30 """ 31 32 self.pagename = pagename 33 self.request = request 34 self.page = Page(request, pagename) 35 36 def do_action(self): 37 request = self.request 38 content_length = getHeader(request, "Content-Length", "HTTP") 39 if content_length: 40 content_length = int(content_length) 41 42 # Get the message. 43 44 message_text = StringIO(request.read(content_length)) 45 self.handle_message(message_text) 46 47 def handle_message(self, message_text): 48 49 "Handle the given 'message_text'." 50 51 request = self.request 52 message = Parser().parse(message_text) 53 mimetype = message.get_content_type() 54 encoding = message.get_content_charset() 55 56 # Detect PGP/GPG-encoded payloads. 57 # See: http://tools.ietf.org/html/rfc3156 58 59 if mimetype == "multipart/encrypted" and \ 60 message.get_param("protocol") == "application/pgp-encrypted": 61 62 try: 63 declaration, part = message.get_payload() 64 except ValueError: 65 writeHeaders(request, "text/plain", getMetadata(self.page), "415 Unsupported Media Type") 66 request.write("There must be a declaration and a content part for signed uploads.") 67 return 68 69 # Verify the message format. 70 71 if part.get_content_type() != "application/octet-stream": 72 writeHeaders(request, "text/plain", getMetadata(self.page), "415 Unsupported Media Type") 73 request.write("Encrypted data must be provided as application/octet-stream.") 74 return 75 76 # Locate the keyring. 77 78 homedir = getattr(request.cfg, "postmessage_gpg_homedir") 79 if not homedir: 80 writeHeaders(request, "text/plain", getMetadata(self.page), "415 Unsupported Media Type") 81 request.write("Encrypted data cannot currently be understood. Please notify the site administrator.") 82 return 83 84 # Decrypt the message text. 85 86 to_child, from_child, error_child = os.popen3(["gpg", "--no-default-keyring", "--homedir", homedir, "--decrypt"]) 87 to_child.write(part.get_payload()) 88 to_child.close() 89 #print >>open("/tmp/log.txt", "a"), error_child.read() 90 91 # Handle the embedded message. 92 93 try: 94 self.handle_plaintext_message(from_child) 95 finally: 96 from_child.close() 97 error_child.close() 98 99 # Reject unsigned payloads. 100 101 else: 102 writeHeaders(request, "text/plain", getMetadata(self.page), "415 Unsupported Media Type") 103 request.write("Only PGP/GPG-signed payloads are supported.") 104 105 def handle_plaintext_message(self, message_text): 106 107 "Handle the given 'message_text'." 108 109 request = self.request 110 message = Parser().parse(message_text) 111 112 # Handle a single part. 113 114 if not message.is_multipart(): 115 self.handle_message_parts([message], to_replace(message)) 116 117 # Handle multiple parts. 118 119 # This can be a collection of updates, with each update potentially being a 120 # collection of alternative representations. 121 122 elif is_collection(message): 123 for part in message.get_payload(): 124 if part.is_multipart(): 125 self.handle_message_parts(part.get_payload(), to_replace(part)) 126 else: 127 self.handle_message_parts([part], to_replace(part)) 128 129 # Or it can be a collection of alternative representations for a single 130 # update. 131 132 else: 133 self.handle_message_parts(message.get_payload(), to_replace(message)) 134 135 # Default output. 136 137 writeHeaders(request, "text/plain", getMetadata(self.page), "204 No Content") 138 139 def handle_message_parts(self, parts, replace): 140 141 """ 142 Handle the given message 'parts', replacing the page content if 143 'replace' is set to a true value. 144 """ 145 146 # NOTE: Should either choose preferred content types or somehow retain them 147 # NOTE: all but present one at a time. 148 149 body = [] 150 151 for part in parts: 152 mimetype = part.get_content_type() 153 encoding = part.get_content_charset() 154 if mimetype == "text/moin": 155 body.append(part.get_payload()) 156 if replace: 157 break 158 159 if not replace: 160 body.append(self.page.get_raw_body()) 161 162 page_editor = PageEditor(self.request, self.pagename) 163 page_editor.saveText("\n\n".join(body), 0) 164 165 def is_collection(message): 166 return message.get("Update-Type") == "Collection" 167 168 def to_replace(message): 169 return message.get("Update-Action") == "replace" 170 171 # Action function. 172 173 def execute(pagename, request): 174 PostMessage(pagename, request).do_action() 175 176 # vim: tabstop=4 expandtab shiftwidth=4