[gnome-maps/wip/jonasdn/service-gnome-3-16: 1/2] mapSource: Get tile server information from service.json

From: Jonas Danielsson <jonasdn src gnome org>
To: commits-list gnome org
Cc:
Subject: [gnome-maps/wip/jonasdn/service-gnome-3-16: 1/2] mapSource: Get tile server information from service.json
Date: Fri, 19 Aug 2016 18:30:17 +0000 (UTC)
commit e6ac45eff18676d7f21d5b928de7881b55dd8919
Author: Jonas Danielsson <jonas threetimestwo org>
Date:   Fri Aug 12 21:27:31 2016 +0200

    mapSource: Get tile server information from service.json
    
    Attempt to download a service.json file from gnome.org. The
    file will define all information needed to create a libchamplain
    source. This will help us to change the tile-server without needing
    to update the application.
    
    If the call to gnome.org fails. Fallback to a default service.json.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769352

 data/Makefile.am                       |    4 +
 data/maps-service.json                 |   42 ++++++++++++
 data/org.gnome.Maps.data.gresource.xml |    2 -
 src/mapSource.js                       |  112 +++++++++++++++++++++++---------
 4 files changed, 126 insertions(+), 34 deletions(-)
---
diff --git a/data/Makefile.am b/data/Makefile.am
index 6498b7b..3ea5782 100644
--- a/data/Makefile.am
+++ b/data/Makefile.am
@@ -11,6 +11,9 @@ org.gnome.Maps.data.gresource: org.gnome.Maps.data.gresource.xml $(app_resource_
                --target=$@                                             \
                --sourcedir=$(srcdir) $<
 
+tileservicedir = $(pkgdatadir)
+tileservice_DATA = maps-service.json
+
 resourcedir = $(pkgdatadir)
 resource_DATA = org.gnome.Maps.data.gresource
 
@@ -44,6 +47,7 @@ EXTRA_DIST =                                                          \
        org.gnome.Maps.data.gresource.xml                               \
        org.gnome.Maps.gschema.xml                                      \
        org.gnome.Maps.appdata.xml.in                                   \
+       maps-service.json                                               \
        $(app_resource_files)                                           \
        $(NULL)
 
diff --git a/data/maps-service.json b/data/maps-service.json
new file mode 100644
index 0000000..dc0a5f1
--- /dev/null
+++ b/data/maps-service.json
@@ -0,0 +1,42 @@
+{
+    "tiles": {
+       "street": {
+            "id": "mapbox.streets-v4",
+            "name": "Mapbox street tiles",
+            "license": "© OpenStreetMap",
+            "license_uri": "http://www.openstreetmap.org/copyright";,
+            "min_zoom_level": 0,
+            "max_zoom_level": 19,
+            "tile_size": 256,
+            "uri_format": 
"https://a.tiles.mapbox.com/v4/mapbox.streets/#Z#/#X#/#Y#.png?access_token=pk.eyJ1IjoiZ25vbWUtbWFwcyIsImEiOiJjaXF3a3lwbXkwMDJwaTBubmZlaGk4cDZ6In0.8aukTfgjzeqATA8eNItPJA&";,
+            "attribution_logo": 
"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+            "max_connections": 12
+       },
+
+       "aerial": {
+           "id": "mapbox.satellite-v4",
+           "name": "Mapbox aerial tiles",
+           "license": "© OpenStreetMap © DigitalGlobe",
+            "license_uri": "http://www.openstreetmap.org/copyright";,
+            "min_zoom_level": 0,
+            "max_zoom_level": 19,
+            "tile_size": 256,
+            "uri_format": 
"https://a.tiles.mapbox.com/v4/mapbox.satellite/#Z#/#X#/#Y#.png?access_token=pk.eyJ1IjoiZ25vbWUtbWFwcyIsImEiOiJjaXF3a3lwbXkwMDJwaTBubmZlaGk4cDZ6In0.8aukTfgjzeqATA8eNItPJA&";,
+           "attribution_logo": 
"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+            "name": "Mapbox print tiles",
+            "license": "© OpenStreetMap",
+            "license_uri": "http://www.openstreetmap.org/copyright";,
+            "min_zoom_level": 0,
+            "max_zoom_level": 19,
+            "tile_size": 256,
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+            "max_connections": 12
+       }
+    }
+}
diff --git a/data/org.gnome.Maps.data.gresource.xml b/data/org.gnome.Maps.data.gresource.xml
index f3e195d..d775af4 100644
--- a/data/org.gnome.Maps.data.gresource.xml
+++ b/data/org.gnome.Maps.data.gresource.xml
@@ -3,7 +3,6 @@
   <gresource prefix="/org/gnome/Maps">
     <file preprocess="xml-stripblanks">ui/account-row.ui</file>
     <file preprocess="xml-stripblanks">ui/app-menu.ui</file>
-    <file preprocess="xml-stripblanks">ui/attribution-logo.ui</file>
     <file preprocess="xml-stripblanks">ui/busy-marker.ui</file>
     <file preprocess="xml-stripblanks">ui/check-in-dialog.ui</file>
     <file preprocess="xml-stripblanks">ui/context-menu.ui</file>
@@ -27,6 +26,5 @@
     <file alias="application.css">gnome-maps.css</file>
     <file alias="ui/maptype-aerial.png">media/maptype-aerial.png</file>
     <file alias="ui/maptype-street.png">media/maptype-street.png</file>
-    <file alias="ui/attribution.svg">media/mapbox-attribution-logo.svg</file>
   </gresource>
 </gresources>
diff --git a/src/mapSource.js b/src/mapSource.js
index c79476a..e5b4d37 100644
--- a/src/mapSource.js
+++ b/src/mapSource.js
@@ -18,55 +18,103 @@
  */
 
 const Champlain = imports.gi.Champlain;
+const GdkPixbuf = imports.gi.GdkPixbuf;
+const Gio = imports.gi.Gio;
+const GLib = imports.gi.GLib;
 const Gtk = imports.gi.Gtk;
 const Lang = imports.lang;
+const Soup = imports.gi.Soup;
 
 const Utils = imports.utils;
 
-/*
- * These URIs are used by the libchamplain network tile source.
- * The #X#, #Y#, #Z# coords will get replaced with actual tile numbers.
- */
-const _AERIAL_URI = "https://gis.gnome.org/tiles/satellite/v1/#Z#/#X#/#Y#";;
-const _STREET_URI = "https://gis.gnome.org/tiles/street/v1/#Z#/#X#/#Y#";;
-
-/* unique names are needed for file caching */
-const _AERIAL_NAME = "mapbox-satellite-v1";
-const _STREET_NAME = "mapbox-street-v1";
+let _tileService = null;
+let _attributionImage = null;
 
-const _TILE_SIZE = 256;
-const _MIN_ZOOM = 0;
-const _MAX_ZOOM = 19;
+const _TILE_SERVICE_URL = 'https://gis.gnome.org/services/v1/service.json';
+const _DEFAULT_SERVICE_FILE = 'maps-service.json';
 
 const _FILE_CACHE_SIZE_LIMIT = (10 * 1024 * 1024); /* 10Mb */
 const _MEMORY_CACHE_SIZE_LIMIT = 100; /* number of tiles */
 
 const AttributionLogo = new Lang.Class({
     Name: 'AttributionLogo',
-    Extends: Gtk.Image,
-    Template: 'resource:///org/gnome/Maps/ui/attribution-logo.ui',
+    Extends: Gtk.Bin,
 
     _init: function() {
-        this.parent();
+        this.parent({ margin_end: 6,
+                      margin_bottom: 25,
+                      halign: Gtk.Align.END,
+                      valign: Gtk.Align.END });
+        this.add(_attributionImage);
     }
 });
 
-function _createTileSource(uri, name) {
-    return new Champlain.NetworkTileSource(
-        { id: name,
-          name: name,
-          license: null,
-          license_uri: null,
-          min_zoom_level: _MIN_ZOOM,
-          max_zoom_level: _MAX_ZOOM,
-          tile_size: _TILE_SIZE,
-          renderer: new Champlain.ImageRenderer(),
-          uri_format: uri
-        });
+function _updateAttributionImage(source) {
+    if (!_attributionImage)
+        _attributionImage = new Gtk.Image();
+
+    if (!source.attribution_logo || source.attribution_logo === "") {
+        _attributionImage.visible = false;
+        return;
+    }
+
+    let data = GLib.base64_decode(source.attribution_logo);
+    let stream = Gio.MemoryInputStream.new_from_bytes(GLib.Bytes.new(data));
+    _attributionImage.pixbuf = GdkPixbuf.Pixbuf.new_from_stream(stream, null);
+ }
+ 
+function _createDefaultService() {
+    let filename = GLib.build_filenamev([pkg.pkgdatadir,
+                                         _DEFAULT_SERVICE_FILE]);
+    let data = Utils.readFile(filename);
+    _tileService = JSON.parse(data).tiles;
+    return _tileService;
+}
+
+function _getTileService() {
+    if (_tileService)
+        return _tileService;
+
+    let user_agent = 'gnome-maps/'  + pkg.version;
+    let session = new Soup.Session({ user_agent : user_agent });
+    let msg = Soup.Message.new('GET', _TILE_SERVICE_URL);
+    try {
+        let stream = Gio.DataInputStream.new(session.send(msg, null));
+
+        let lines = "";
+        while(true) {
+            let [line, _] = stream.read_line_utf8(null);
+            if (line === null)
+                break;
+            lines += line;
+        }
+        _tileService = JSON.parse(lines).tiles;
+        return _tileService;
+    } catch(e) {
+        Utils.debug(e);
+        return _createDefaultService();
+    }
+}
+
+function _createTileSource(source) {
+    let tileSource = new Champlain.NetworkTileSource({
+        id: source.id,
+        name: source.name,
+        license: source.license,
+        license_uri: source.license_uri,
+        min_zoom_level: source.min_zoom_level,
+        max_zoom_level: source.max_zoom_level,
+        tile_size: source.tile_size,
+        renderer: new Champlain.ImageRenderer(),
+        uri_format: source.uri_format
+    });
+    tileSource.max_conns = source.max_connections;
+    return tileSource;
 }
 
-function _createCachedSource(uri, name) {
-    let tileSource = _createTileSource(uri, name);
+function _createCachedSource(source) {
+    let tileSource = _createTileSource(source);
+    _updateAttributionImage(source);
 
     let fileCache = new Champlain.FileCache({
         size_limit: _FILE_CACHE_SIZE_LIMIT,
@@ -97,9 +145,9 @@ function _createCachedSource(uri, name) {
 }
 
 function createAerialSource() {
-    return _createCachedSource(_AERIAL_URI, _AERIAL_NAME);
+    return _createCachedSource(_getTileService().aerial);
 };
 
 function createStreetSource() {
-    return _createCachedSource(_STREET_URI, _STREET_NAME);
+    return _createCachedSource(_getTileService().street);
 };
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