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From "Andrew Grieve (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-285) Add property returning root path of PhoneGap files
Date Tue, 05 Feb 2013 16:38:12 GMT

    [ https://issues.apache.org/jira/browse/CB-285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571437#comment-13571437
] 

Andrew Grieve commented on CB-285:
----------------------------------

I like the idea of switching PERSISTENT to be internal-only. The W3C spec intends this area
to be sandboxed to the app, so shouldn't be on the sdcard.

I think we need more than just an APP constant though, as there are many places where an app
might want to put things.

For iOS, You'd minimally want:
1. Application bundle,
2. <Application_Home>


The other locations are all subdirectories of <Application_Home>, so not a big deal
if we don't have constants for them

For Android, You'd minimally want:
1. Assets directory (seems like a parallel to iOS Application Bundle)
2. Application data on internal storage (/data/data/$PACKAGE_NAME/files)
3. Application cache on internal storage (/data/data/$PACKAGE_NAME/cache)
4. External root: (/sdcard)

We could maybe combine #2 and #3 into a single one that gave you /data/data/$PACKAGE_NAME,
and document that Android wants files in the "files" and "cache" directories.



The Ideal iOS constants:
 1. PERSISTENT changes from <Application_Home>/Documents --> <Application_Home>/Library/CdvPersistentStorage
 2. TEMPORARY changes from <Application_Home>/tmp --> <Application_Home>/tmp/CdvTemporaryStorage
 3. APP_ASSETS --> Application bundle
 4. APP_DATA --> <Application_Home>

The main reason for changing #1 is that iCloud treats Documents directory specially
The main reason for adding subdirs under Library/tmp is that it keeps the storage areas separate
from the rest of the app (apps that have native components won't interfere with the webview's
storage area).

The ideal Android constants:
 1. PERSISTENT --> /data/data/$PACKAGE_NAME/files/CdvPersistentStorage
 2. TEMPORARY --> /data/data/$PACKAGE_NAME/cache/CdvTemporaryStorage
 3. APP_ASSETS --> assets directory
 4. APP_DATA --> /data/data/$PACKAGE_NAME
 5. EXTERNAL_APP_DATA --> /sdcard/Android/data/$PACKAGE_NAME
 6. EXTERNAL_ROOT --> /sdcard


I even think there would be merit in adding more constants (e.g. DOCUMENTS, android resources)
going forward, but one step at a time...


== Transitioning to these new constants ==

TEMPORARY: 
Use the new path right away. No need to transition since the files there are temporary anyways.


PERSISTENT (iOS):
- If new location directory exists, use that.
- Else, if any files exist in the legacy location, use the legacy location
- Else, use the new path.

PERSISTENT (Android):
- PERSISTENT is currently /sdcard, so files will always exist :(

In both cases, add a PERSISTENT_NEW constant to allow them to move their files over.
In Cordova 3.0, change PERSISTENT to be PERSISTENT_NEW, and add PERSISTENT_LEGACY (in case
apps have still not switched).






Side issue:

The spec says PERSISTENT and TEMPORARY are constants on the window object (ugh). So far though,
Cordova has exposed them not as globals, but instead as LocalFileSystem.PERSISTENT and LocalFileSystem.TEMPORARY.
I like the idea of exposing them on LocalFileSystem, but we should also put PERSISTENT and
TEMPORARY on the window.






                
> Add property returning root path of PhoneGap files
> --------------------------------------------------
>
>                 Key: CB-285
>                 URL: https://issues.apache.org/jira/browse/CB-285
>             Project: Apache Cordova
>          Issue Type: Improvement
>          Components: CordovaJS
>    Affects Versions: 1.4.0
>         Environment: Both PhoneGap SDK and PhoneGap Build
>            Reporter: Ashley Gullen
>            Assignee: Andrew Grieve
>              Labels: features
>
> There needs to be a property in PhoneGap that returns the root path to the general files
added to the PhoneGap project (i.e. the directory index.html is in).  For example, if I add
'music.mp3' to my project, in Android it will be located in:
> /android_asset/www/music.mp3
> On iOS after being built with PhoneGap Build it will be located in some path like this:
> /var/mobile/Applications/<app_ID>/<name>.app/www/music.mp3
> However, there does not appear to be a programmatic way to determine both <app_ID>
and <name>.app.
> This has two side effects:
> 1. Paths to audio for Media must be hard-coded separately depending on the platform,
which is inconvenient.
> 2. Paths to audio for Media cannot be known if developing a framework that uses PhoneGap.
 Since a framework does not know the App ID or name in advance, it's impossible for the framework
to determine the correct path.
> This is actively blocking audio from working on iOS in PhoneGap projects exported by
Construct 2 (www.scirra.com), a HTML5 game creator.  Also, it seems like kind of an important
function to make available anyway, since hard-coding paths for each platform is a pain.
> This PhoneGap Support thread led to this issue: http://phonegap.tenderapp.com/discussions/questions/208-android_asset-equivalent-for-ios

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