[Pkg-javascript-commits] [sockjs-client] 298/434: New protocol detection algorithm.

[Tonnerre Lombard]

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tonnerre-guest pushed a commit to branch master
in repository sockjs-client.

commit 5dac751a5f0fc3d40df142532852ab0b9e649e09
Author: Marek Majkowski <majek04 at gmail.com>
Date:   Fri Jan 13 15:32:29 2012 +0000

    New protocol detection algorithm.
---
 lib/utils.js                    | 64 +++++++++++++++++++++++++++++++++++++++++
 tests/html/src/unittests.coffee | 61 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 125 insertions(+)

diff --git a/lib/utils.js b/lib/utils.js
index ca317b7..fafb93d 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -219,3 +219,67 @@ utils.quote = function(string) {
     });
 }
 
+var _all_protocols = ['websocket',
+                      'xdr-streaming',
+                      'xhr-streaming',
+                      'iframe-eventsource',
+                      'iframe-htmlfile',
+                      'xdr-polling',
+                      'xhr-polling',
+                      'iframe-xhr-polling',
+                      'jsonp-polling'];
+
+utils.probeProtocols = function() {
+    var probed = {};
+    for(var i=0; i<_all_protocols.length; i++) {
+        var protocol = _all_protocols[i];
+        // User can have a typo in protocol name.
+        probed[protocol] = SockJS[protocol] &&
+                           SockJS[protocol].enabled();
+    }
+    return probed;
+};
+
+utils.detectProtocols = function(probed, protocols_whitelist, info) {
+    var pe = {},
+        protocols = [];
+    if (!protocols_whitelist) protocols_whitelist = _all_protocols;
+    for(var i=0; i<protocols_whitelist.length; i++) {
+        var protocol = protocols_whitelist[i];
+        pe[protocol] = probed[protocol];
+    }
+    var maybe_push = function(protos) {
+        var proto = protos.shift();
+        if (pe[proto]) {
+            protocols.push(proto);
+        } else {
+            if (protos.length > 0) {
+                maybe_push(protos);
+            }
+        }
+    }
+
+    // 1. Websocket
+    if (info.websocket !== false) {
+        maybe_push(['websocket']);
+    }
+
+    // 2. Streaming
+    if (pe['xdr-streaming'] && !info.cookie_needed) {
+        protocols.push('xdr-streaming');
+    } else {
+        maybe_push(['xhr-streaming',
+                    'iframe-eventsource',
+                    'iframe-htmlfile']);
+    }
+
+    // 3. Polling
+    if (pe['xdr-polling'] && !info.cookie_needed) {
+        protocols.push('xdr-polling');
+    } else {
+        maybe_push(['xhr-polling',
+                    'iframe-xhr-polling',
+                    'jsonp-polling']);
+    }
+    return protocols;
+}
diff --git a/tests/html/src/unittests.coffee b/tests/html/src/unittests.coffee
index b102c2c..cab6ba7 100644
--- a/tests/html/src/unittests.coffee
+++ b/tests/html/src/unittests.coffee
@@ -84,3 +84,64 @@ test 'quote', ->
     all_chars = c.join('')
     ok(JSON.parse(u.quote(all_chars)) is all_chars, "Quote/unquote all 64K chars.")
 
+test 'detectProtocols', ->
+    chrome_probed = {
+        'websocket': true
+        'xdr-streaming': false
+        'xhr-streaming': true
+        'iframe-eventsource': true
+        'iframe-htmlfile': true
+        'xdr-polling': false
+        'xhr-polling': true
+        'iframe-xhr-polling': true
+        'jsonp-polling': true
+    }
+    # Chrome
+    deepEqual(u.detectProtocols(chrome_probed, null, {}),
+            ['websocket', 'xhr-streaming', 'xhr-polling'])
+    deepEqual(u.detectProtocols(chrome_probed, null, {websocket:false}),
+            ['xhr-streaming', 'xhr-polling'])
+    # Opera
+    opera_probed = {
+        'websocket': false
+        'xdr-streaming': false
+        'xhr-streaming': false
+        'iframe-eventsource': true
+        'iframe-htmlfile': true
+        'xdr-polling': false
+        'xhr-polling': false
+        'iframe-xhr-polling': true
+        'jsonp-polling': true
+    }
+    deepEqual(u.detectProtocols(opera_probed, null, {}),
+            ['iframe-eventsource', 'iframe-xhr-polling'])
+    # IE 6, IE 7
+    ie6_probed = {
+        'websocket': false
+        'xdr-streaming': false
+        'xhr-streaming': false
+        'iframe-eventsource': false
+        'iframe-htmlfile': false
+        'xdr-polling': false
+        'xhr-polling': false
+        'iframe-xhr-polling': false
+        'jsonp-polling': true
+    }
+    deepEqual(u.detectProtocols(ie6_probed, null, {}),
+            ['jsonp-polling'])
+    # IE 8, IE 9
+    ie8_probed = {
+        'websocket': false
+        'xdr-streaming': true
+        'xhr-streaming': false
+        'iframe-eventsource': false
+        'iframe-htmlfile': true
+        'xdr-polling': true
+        'xhr-polling': false
+        'iframe-xhr-polling': true
+        'jsonp-polling': true
+    }
+    deepEqual(u.detectProtocols(ie8_probed, null, {}),
+            ['xdr-streaming', 'xdr-polling'])
+    deepEqual(u.detectProtocols(ie8_probed, null, {cookie_needed:true}),
+            ['iframe-htmlfile', 'iframe-xhr-polling'])

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