Add basic support for versioned link

www/common/common-hash.js

@@ -171,7 +171,7 @@ Version 1
                 return true;
             }
         });
-        return k;
+        return k ? Crypto.b64AddSlashes(k) : '';
     };
     var getOwnerKey = function (hashArr) {
         var k;
@@ -227,6 +227,9 @@ Version 1
                 if (opts.embed) { hash += 'embed/'; }
                 if (opts.present) { hash += 'present/'; }
                 var versionHash = typeof(opts.versionHash) !== "undefined" ? opts.versionHash : parsed.versionHash;
+                if (versionHash) {
+                    hash += 'hash=' + Crypto.b64RemoveSlashes(versionHash) + '/';
+                }
                 return hash;
             };
 

www/common/inner/share.js

@@ -329,6 +329,9 @@ define([
         }
 
         // warning about sharing links
+        // when sharing a version hash, there is a similar warning and we want
+        // to avoid alert fatigue
+        if (!opts.versionHash) {
             var localStore = window.cryptpadStore;
             var dismissButton = h('span.fa.fa-times');
             var shareLinkWarning = h('div.alert.alert-warning.dismissable',
@@ -349,6 +352,7 @@ define([
                 });
 
             });
+        }
 
         // Burn after reading
         if (opts.barAlert) { linkContent.push(opts.barAlert.cloneNode(true)); }
@@ -460,7 +464,8 @@ define([
         var pathname = opts.pathname;
         var parsed = Hash.parsePadUrl(pathname);
         var canPresent = ['code', 'slide'].indexOf(parsed.type) !== -1;
-        var canBAR = parsed.type !== 'drive';
+        var versionHash = hashes.viewHash && opts.versionHash;
+        var canBAR = parsed.type !== 'drive' && !versionHash;
 
         var burnAfterReading = (hashes.viewHash && canBAR) ?
                     UI.createRadio('accessRights', 'cp-share-bar', Messages.burnAfterReading_linkBurnAfterReading, false, {
@@ -519,6 +524,12 @@ define([
             var embed = val.embed;
             var present = val.present !== undefined ? val.present : Util.isChecked($rights.find('#cp-share-present'));
             var burnAfterReading = Util.isChecked($rights.find('#cp-share-bar'));
+            if (versionHash) {
+                edit = false;
+                embed = false;
+                present = false;
+                burnAfterReading = false;
+            }
             if (burnAfterReading && !opts.burnAfterReadingUrl) {
                 if (cb) { // Called from the contacts tab, "share" button
                     var barHref = origin + pathname + '#' + (hashes.viewHash || hashes.editHash);
@@ -533,7 +544,7 @@ define([
             var href = burnAfterReading ? opts.burnAfterReadingUrl
                                              : (origin + pathname + '#' + hash);
             var parsed = Hash.parsePadUrl(href);
-            return origin + parsed.getUrl({embed: embed, present: present});
+            return origin + parsed.getUrl({embed: embed, present: present, versionHash: versionHash});
         };
         opts.getEmbedValue = function () {
             var url = opts.getLinkValue({
@@ -543,7 +554,11 @@ define([
         };
 
         // disable edit share options if you don't have edit rights
-        if (!hashes.editHash) {
+        if (versionHash) {
+            $rights.find('#cp-share-editable-false').attr('checked', true);
+            $rights.find('#cp-share-present').removeAttr('checked').attr('disabled', true);
+            $rights.find('#cp-share-editable-true').removeAttr('checked').attr('disabled', true);
+        } else if (!hashes.editHash) {
             $rights.find('#cp-share-editable-false').attr('checked', true);
             $rights.find('#cp-share-editable-true').removeAttr('checked').attr('disabled', true);
         } else if (!hashes.viewHash) {
@@ -582,7 +597,9 @@ define([
         // Set default values
         common.getAttribute(['general', 'share'], function (err, val) {
             val = val || {};
-            if (val.present && canPresent) {
+            if (versionHash) {
+                $rights.find('#cp-share-editable-false').prop('checked', true);
+            } else if (val.present && canPresent) {
                 $rights.find('#cp-share-editable-false').prop('checked', false);
                 $rights.find('#cp-share-editable-true').prop('checked', false);
                 $rights.find('#cp-share-present').prop('checked', true);
@@ -671,9 +688,22 @@ define([
             onHide: resetTab
         }];
         Modal.getModal(common, opts, tabs, function (err, modal) {
-            $(modal).find('.cp-bar').hide();
+            // Hide the burn-after-reading option by default
+            var $modal = $(modal);
+            $modal.find('.cp-bar').hide();
+
             // Prepend the "rights" radio selection
-            $(modal).find('.alertify-tabs-titles').after($rights);
+            $modal.find('.alertify-tabs-titles').after($rights);
+
+            // Add the versionHash warning if needed
+            if (opts.versionHash) {
+                Messages.share_versionHash = "You're going to share the selected history version of the document in read-only mode. This will also <b>give view access</b> to the recipients."; // XXX
+                $rights.after(h('div.alert.alert-warning', [
+                    h('i.fa.fa-history'),
+                    UI.setHTML(h('span'), Messages.share_versionHash)
+                ]));
+            }
+
             // callback
             cb(err, modal);
         });

www/common/outer/async-store.js

@@ -1455,7 +1455,47 @@ define([
 
         var channels = Store.channels = store.channels = {};
 
+        var getVersionHash = function (clientId, data) {
+            var validateKey;
+            var fakeNetflux = Hash.createChannelId();
+            nThen(function (waitFor) {
+                Store.getPadMetadata(null, {
+                    channel: data.channel
+                }, function (md) {
+                    // XXX not needed? we don't need to validate messages coming from history keeper
+                    validateKey = md.validateKey;
+                });
+            }).nThen(function () {
+                Store.getHistoryRange(clientId, {
+                    cpCount: 1,
+                    channel: data.channel,
+                    lastKnownHash: data.versionHash
+                }, function (obj) {
+                    if (obj && obj.error) {
+                        postMessage(clientId, "PAD_ERROR", obj.error);
+                        return;
+                    }
+                    postMessage(clientId, "PAD_CONNECT", {
+                        myID: fakeNetflux,
+                        id: data.channel,
+                        members: [fakeNetflux]
+                    });
+                    (obj.messages || []).forEach(function (data) {
+                        postMessage(clientId, "PAD_MESSAGE", {
+                            msg: data.msg,
+                            user: fakeNetflux.slice(0,16), // fake history keeper to avoid validate
+                            validateKey: validateKey
+                        });
+                    });
+                    postMessage(clientId, "PAD_READY");
+                });
+            });
+        };
+
         Store.joinPad = function (clientId, data) {
+            if (data.versionHash) {
+                return void getVersionHash(clientId, data);
+            }
             var isNew = typeof channels[data.channel] === "undefined";
             var channel = channels[data.channel] = channels[data.channel] || {
                 queue: [],
@@ -2046,7 +2086,7 @@ define([
             network.on('message', onMsg);
             network.sendto(hk, JSON.stringify(['GET_HISTORY_RANGE', data.channel, {
                 from: data.lastKnownHash,
-                cpCount: 2,
+                cpCount: data.cpCount || 2,
                 txid: txid
             }]));
         };

www/common/sframe-chainpad-netflux-outer.js

@@ -28,10 +28,13 @@ define([], function () {
         var padRpc = conf.padRpc;
         var sframeChan = conf.sframeChan;
         var metadata= conf.metadata || {};
+        var versionHash = conf.versionHash;
         var validateKey = metadata.validateKey;
         var onConnect = conf.onConnect || function () { };
         conf = undefined;
 
+        if (versionHash) { readOnly = true; }
+
         padRpc.onReadyEvent.reg(function () {
             sframeChan.event('EV_RT_READY', null);
         });
@@ -132,6 +135,7 @@ define([], function () {
         padRpc.joinPad({
             channel: channel || null,
             readOnly: readOnly,
+            versionHash: versionHash,
             metadata: metadata
         });
     };

www/common/sframe-common-outer.js

@@ -445,6 +445,7 @@ define([
                         feedbackAllowed: Utils.Feedback.state,
                         isPresent: parsed.hashData && parsed.hashData.present,
                         isEmbed: parsed.hashData && parsed.hashData.embed,
+                        isHistoryVersion: parsed.hashData && parsed.hashData.versionHash,
                         accounts: {
                             donateURL: Cryptpad.donateURL,
                             upgradeURL: Cryptpad.upgradeURL
@@ -1499,6 +1500,7 @@ define([
                 var cpNfCfg = {
                     sframeChan: sframeChan,
                     channel: secret.channel,
+                    versionHash: parsed.hashData && parsed.hashData.versionHash,
                     padRpc: Cryptpad.padRpc,
                     validateKey: secret.keys.validateKey || undefined,
                     isNewHash: isNewHash,