1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
var pull = require("pull-stream");
var Pushable = require("pull-pushable");
var many = require("./pull-many-v2");
const fs = require("fs");
const home = require("os").homedir();
const path = require("path");
// Change to 'true' to get debugging output
DEBUG = false
FRIENDS_POLL_TIME = 1 // ms
GRAPH_TYPE = "follow"
MAX_HOPS = 1
SBOT_ROOT = path.join(home, ".ssb");
SBOT_BLOB_DIR = path.join(SBOT_ROOT, "blobs");
SBOT_BLOBS_FILE = path.join(SBOT_BLOB_DIR, "allowed_blobs");
class StreamData {
constructor() {
this.finished = false,
this.oldestTimestampSeen = Number.MAX_SAFE_INTEGER,
this.waitingMessages = []
this.markFinished = function() {
this.finished = true,
this.oldestTimestampSeen = 0
}
}
}
class StreamController {
constructor(client, opts) {
this.client = client,
this.outputStream = Pushable(),
this.allowedBlobs = [],
this.streamData = {
channelStream: new StreamData(),
hashtagStream: new StreamData(),
},
this.pushMessage = function(source, newMsg) {
var streamData = source == "hashtag" ? this.streamData.hashtagStream : this.streamData.channelStream;
streamData.oldestTimestampSeen = newMsg.value.timestamp;
if(newMsg.value.timestamp > opts.gt && newMsg.value.timestamp < opts.lt) {
streamData.waitingMessages.push(newMsg);
}
this.pushNewlySafeMessages();
},
this.pushNewlySafeMessages = function() {
var newlySafeMessages = [];
var oldestSafeTimestamp = Math.max(...Object.values(this.streamData).map(datum => datum.oldestTimestampSeen));
for(var streamDataIndex in this.streamData) {
var streamDatum = this.streamData[streamDataIndex]
while(streamDatum.waitingMessages.length && streamDatum.waitingMessages[0].value.timestamp >= oldestSafeTimestamp) {
var safeMsg = streamDatum.waitingMessages.shift(); // pop the newest waiting message
newlySafeMessages.push(safeMsg);
}
}
// in general, newlySafeMessages might not be in order, we should sort before appending
newlySafeMessages.sort((msg1, msg2) => (msg1.value.timestamp > msg2.value.timestamp ? -1 : 1));
for(var msgIndex in newlySafeMessages) {
this.outputStream.push(newlySafeMessages[msgIndex]);
this.requestBlobs(newlySafeMessages[msgIndex]);
}
},
this.finish = function() {
for(var datumIndex in this.streamData) {
this.streamData[datumIndex].oldestTimestampSeen = 0;
}
this.pushNewlySafeMessages();
fs.writeFile(SBOT_BLOBS_FILE, this.allowedBlobs.join("\n"), function(err) {
debug("Failed to write allowed blobs to file: \n" + err);
});
this.outputStream.end();
},
this.requestBlobs = function(msg) {
let client = this.client; // did the javascript devs ever consider that you might have a callback inside a member function? no? ok
if(msg.value && msg.value.content) {
if(msg.value.content.mentions) {
for(let mention of msg.value.content.mentions) {
if(mention.type && mention.link) {
this.getBlob(mention.link)
}
}
}
if(msg.value.content.image) {
this.getBlob(msg.value.content.image);
}
}
}
this.getBlob = function(blobId) {
this.allowedBlobs.push(blobId);
debug("Ensuring existence of blob with ID " + blobId);
client.blobs.has(blobId, function(err, has) {
if(err) {
debug("[ERROR] ssb.blobs.has failed on the blob with ID " + blobId);
}
if(!err && !has) {
debug("Wanting blob with ID " + blobId);
client.blobs.want(blobId, function() {
debug("Downloaded blob with ID " + blobId);
});
}
});
}
}
}
module.exports = {
getMessages: function(client, channelName, opts, preserve, cb, hops=MAX_HOPS) {
ensureFiles();
client.friends.hops({
dunbar: Number.MAX_SAFE_INTEGER,
max: hops
}, function(error, friends) {
if(error) {
throw "Couldn't get a list of friends from scuttlebot:\n" + error;
}
var followedIds = Object.keys(friends).map(id => id.toLowerCase());
getMessagesFrom(client, channelName, followedIds, opts, preserve, cb);
});
}
}
function getMessagesFrom(client, channelName, followedIds, opts, preserve, cb) {
var channelTag = "#" + channelName;
var streamController = new StreamController(client, opts);
var hashtagStream = createHashtagStream(client, channelName);
var channelStream = createChannelStream(client, channelName);
var stream = many([hashtagStream, channelStream]);
pull(stream, pull.filter(function(msg) {
return followedIds.includes(msg.data.value.author.toLowerCase());
}), pull.filter(function(msg) {
var hasHashtag = msg.data.value.content && msg.data.value.content.text && typeof(msg.data.value.content.text) == "string" && msg.data.value.content.text.includes(channelTag);
if(msg.source == "hashtag") {
return hasHashtag;
}
else {
return !hasHashtag; // prevents us from double-counting messages with both the hashtag and the channel header
}
}), pull.drain(function(msg) {
streamController.pushMessage(msg.source, msg.data);
}, function() {
streamController.finish();
}));
cb(streamController.outputStream, preserve);
}
function createHashtagStream(client, channelName, opts) {
var search = client.search && client.search.query;
if(!search) {
console.log("[FATAL] ssb-search plugin must be installed to us channels");
process.exit(5);
}
var query = search({
query: channelName
});
query.streamName = "hashtag"; // mark the stream object so we can tell which stream an object came from
return query;
}
function createChannelStream(client, channelName, opts) {
var query = client.query.read({
query: [{
"$filter": {
value: {
content: {
channel: channelName
}
}
}
}],
reverse: true
});
query.streamName = "channel"; // mark the stream object so we can tell which stream a message came from later
return query;
}
function ensureFiles() {
if (!fs.existsSync(SBOT_ROOT)) {
debug("no ~/.ssb folder detected, creating it...");
fs.mkdirSync(SBOT_ROOT);
}
if (!fs.existsSync(SBOT_BLOB_DIR)) {
debug("no blobs folder detected, creating it...");
fs.mkdirSync(SBOT_BLOB_DIR);
}
if (!fs.existsSync(SBOT_BLOBS_FILE)) {
debug("no metadata file found, creating it...");
fs.writeFileSync(SBOT_BLOBS_FILE, "");
}
}
function debug(message) {
if(DEBUG) {
var timestamp = new Date();
console.log("[channels-lib] [" + timestamp.toISOString() + "] " + message);
}
}
|
