From 047a63ec20dce3e2b3a659847182434dcea2401c Mon Sep 17 00:00:00 2001
From: Jeff Becker <ampernand@gmail.com>
Date: Mon, 8 Feb 2016 12:42:25 -0500
Subject: [PATCH] add initial lynxhub importer

---
 contrib/tools/migrate/lynxchan/lynx2nntp.js | 185 ++++++++++++++++++++
 1 file changed, 185 insertions(+)
 create mode 100755 contrib/tools/migrate/lynxchan/lynx2nntp.js

diff --git a/contrib/tools/migrate/lynxchan/lynx2nntp.js b/contrib/tools/migrate/lynxchan/lynx2nntp.js
new file mode 100755
index 0000000..a3d2d5c
--- /dev/null
+++ b/contrib/tools/migrate/lynxchan/lynx2nntp.js
@@ -0,0 +1,185 @@
+#!/usr/bin/env nodejs
+
+var memegod = require("mongodb");
+var memegodClient = memegod.MongoClient;
+var assert = require("assert");
+var http = require("http");
+
+
+// memegod daemon url
+var url = "mongodb://127.0.0.1:27017/lynxchan";
+
+// nntp frontend name for article import
+var frontendName = "memegod.import";
+// srndv2 http frontend server to do api requests against 
+var srndApiServ = "localhost";
+var srndApiPort = 18000;
+// username password combo for using api
+var srndApiLogin = "user:pass";
+// some memegod thing
+var idPrefix="v1-";
+
+
+// create a newsgroup name given board name
+var makeGroupName = function(board) {
+  return "overchan.test.endchan." + board;
+}
+
+// call function for each op on a board
+var foreachOpsOnBoard = function(db, board, callback) {
+  var cur = db.collection("threads").find({boardUri: board});
+  cur.each(function(err, doc) {
+    if (doc) {
+      callback(doc);
+    } else {
+      console.log("error fetching op on "+board+" "+err);
+    }
+  });
+}
+
+// call a callback for each reply to op
+// pass in the memegod post
+var foreachReplyForOP = function(db, op, callback) {
+  getMessageIDForMemegodID(idPrefix+op._id, function(msgid) {
+    var cur = db.collection("posts").find({ threadId: op.threadId});
+    cur.each(function (err, doc) {
+      callback(doc);
+    });
+  }, function() {
+    // not found?
+    console.log("op not in database!? "+op._id);
+  });
+}
+
+// find all boards in memegod
+// call callback for each board
+var foreachBoard = function(db, callback) {
+   var cursor = db.collection('boards').find();
+   cursor.each(function(err, doc) {
+     if (doc) {
+       callback(doc)
+     }
+   });
+};
+
+
+// convert a memegod post from board into an overchan article
+// call a callback with the created post
+var createArticle = function(post, board, callback) {
+  var article = {
+    ip: post.ip.join("."),
+    message: post.message || " ",
+    frontend: frontendName,
+    newsgroup: makeGroupName(board),
+    headers: {
+    }
+  };
+  article.headers["X-Memegod-Post-Id"] = post.postId;
+  article.headers["X-Memegod-Thread-Id"] = post.threadId;
+  article.headers["X-Memegod-Id"] = idPrefix+post._id;
+  article.headers["X-Migrated-From"] = "MemeGod";
+  article.name = post.name || "Stephen Lynx";
+  article.subject = post.subject || "MongoDB is Web Scale";
+  
+  callback(article);
+}
+
+// get message id given a memegod id
+// must have already been inserted
+// call callback pass in message id
+var getMessageIDForMemegodID = function(id, callback) {
+  checkViaHeader("X-Memegod-Id", id, function(msgid) {
+    callback(msgid);
+  }, function() { console.log("message is not there?! "+id); });
+}
+
+// post an overchan article via the api
+// call callback passing in the message-id of the new post
+var postArticle = function(article, callback) {
+  var req = http.request({
+    port: srndApiPort,
+    method: "POST",
+    path: "/api/post",
+    auth: srndApiLogin,
+    headers: {
+      "Content-Type": "text/json",
+    }
+  }, function(res) {
+    var data = "";
+    res.on("data", function (chunk) {
+      data += chunk;
+    });
+    res.on("end", function() {
+      var j = JSON.parse(data)
+      if (j) {
+        var msgid = j[0];
+        callback(msgid);
+      }
+    })
+  });
+  req.write(json.stringify(article));
+  req.end();
+}
+
+// check if an article exists given header name and header value
+var checkViaHeader = function(name, value, yesCb, noCb) {
+  var req = http.request({
+    port: srndApiPort,
+    method: "GET",
+    path: "/api/header?name="+name+"&value="+value,
+  }, function (res) {
+    var data = "";
+    res.on("data", function(chnk) {
+      data += chnk;
+    });
+    res.on("end", function() {
+      var j = JSON.parse(data);
+      if ( j.length > 0 ) {
+        // it exists
+        yesCb(j[0]);
+      } else {
+        // does not exist
+        noCb();
+      }
+    });
+  });
+}
+
+// check if a post exists 
+var checkPostExists = function(post, yescb, nocb) {
+  checkViaHeader("X-Memegod-Id", idPrefix + post._id,
+                 function(msgid) { yescb(post, msgid); },
+                 function() { nocb(post); });
+}
+
+var putBoard = function(db, board) {
+  // for each op
+  foreachOpsOnBoard(db, board.boardUri, function(op) {
+    // create OP
+    createArticle(op, board.boardUrl, function(opArticle) {
+      // post OP
+      postArticle(opArticle, function (opMsgId) {
+        console.log("posted op "+ opMsgId);
+        // for each reply for OP
+        foreachReplyForOP(db, op, function(post) {
+          // put create reply
+          createArticle(post, board.boardUri, function(article) {
+            // set references header
+            article.headers["References"] = opMsgId;
+            postArticle(article, function(replyMsgId) {
+              console.log("posted reply to "+opMsgId+" as "+replyMsgId);
+            });
+          });
+        });
+      });              
+    });
+  });
+}
+
+memegodClient.connect(url, function(err, db) {
+  console.log("connected to the meme god");
+  foreachBoard(db, function(board) {
+    console.log("put board: "+board.boardUri);
+    putBoard(db, board);
+  });
+});