NPAPI:ClearSiteData: Difference between revisions

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Revision as of 20:57, 6 January 2011

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→‎Definition of domain

Dwitte

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 = Status =
-(work in progress)
+Accepted, ready for implementation.
-= Problem Summary =
+= Contributors =
-In short: let the UA's "clear cookies" function also clear Flash's local storage.
+* Last modified: January 6, 2011
+* Authors: Julian Reschke (greenbytes), Dan Witte (Mozilla), Bernhard Bauer (Chromium), Rajesh Gwalani (Adobe), Josh Aas (Mozilla), Maciej Stachowiak (Apple)
-More precisely: delegate calls to the UAs "clear privacy information" to plugins, allowing them to clean up their locally stored data as well.
+= Overview =
-== Overview of current UIs ==
+Allows browsers to discover and clear plugin private data.
-{|
+= Specification  =
-! Type || Firefox || IE || Opera || Safari || Chrome
-|-
-! Browsing History
-| yes || yes || yes || yes || yes
-|-
-! Download History
-| yes || yes || yes || yes || yes
-|-
-! Form History
-| yes || yes || ? || yes || yes
-|-
-!  Search History
-| yes || ? || ? || ? || ?
-|-
-! Cookies
-| yes || yes || temporary/all || yes || yes
-|-
-! Cache
-| yes || yes || yes || yes || yes
-|-
-! Active Logins
-| yes || yes || "password manager" || yes || yes
-|-
-! Site Preferences
-| yes || ? || ? || ? || ?
-|}
-In addition, IE has "InPrivate Filtering Data" (what is this?)
+== Definition of domain ==
-In addition, Opera has "delete password protected pages and data" and "bookmark visited times".
+The return value of NPP_GetSitesWithData and the 'site' argument to NPP_ClearSiteData must be domains only (not complete URIs or IRIs). For ASCII domains, they must be lowercase; in the case of internationalized domains, they must be NFKC-encoded (normalized) UTF-8. No other encoding is allowed. IP address literals must be enclosed in square brackets '[]'. This is in accordance with RFC 3987, Internationalized Resource Identifiers (IRIs).
-In addition, Safari has "webpage preview images", "website icons" and "top sites"
+== Discovering Data ==
-{|
+The following method will allow browsers to discover which sites a plugin has data for. Note that plugins (but no instances) must be initialized and function tables retrieved in order to call this method.
-! Parameters || Firefox || IE || Opera || Safari || Chrome
-|-
-! Time Range
-| yes || no || no || no || yes
-|-
-! By Site
-| yes (context menu in history) || ?? || ?? || ?? || ??
-|}
-= Existing Discussion and Documentation =
+<pre>
+char** NPP_GetSitesWithData(void);
+</pre>
-Mail thread on plugin-futures: [https://mail.mozilla.org/private/plugin-futures/2010-January/001150.html https://mail.mozilla.org/private/plugin-futures/2010-January/001150.html]
+This function returns a <code>NULL</code>-terminated list of sites with data. Each site string is a domain as specified above under 'Definition of domain'. Memory for the array and the site strings must be allocated with <code>NPN_MemAlloc</code> and the browser will be responsible for freeing the memory with <code>NPN_MemFree</code>.
-In particular, Lloyd Hilaiel proposed an alternate approach where plugins would store everything in a standard filesystem based layout, so the UA itself can do the clearing. See [https://mail.mozilla.org/private/plugin-futures/2010-January/001156.html https://mail.mozilla.org/private/plugin-futures/2010-January/001156.html]
+== Clearing Data ==
-= API Requirements =
+The following method will allow browsers to request that plugins clear data. Note that plugins (but no instances) must be initialized and function tables retrieved in order to call this method.
-=== Type of Data ===
+<pre>
+NPError NPP_ClearSiteData(
+   const char* site,       // site for which to clear data
+   uint64_t flags,         // what type of data to clear
+   uint64_t maxAge         // max. age of information in seconds
+);
+</pre>
-=== Time range ===
+* The <code>site</code> argument is interpreted as follows:
+** If <code>NULL</code>, all site-specific data and more generic data on browsing history (for instance, number of sites visited) should be cleared.
+** If <code>!NULL</code>, argument is a site string from the discovery API (an exact copy or the original). See above under 'Definition of domain' for the required form of the string. The browser is responsible for allocating and freeing the memory used for this argument. The plugin must copy the string in order to retain it outside the scope of the call.
+* The <code>flags</code> argument is a bit mask representing the type(s) of data to clear.
+<pre>
+#define NP_CLEAR_ALL     0      /* Clear all private data */
+#define NP_CLEAR_CACHE   1 << 0 /* Clear cached data which can simply be
+                                   retrieved again as requested. To be used
+                                   out of concern for space and not necessarily
+                                   privacy. */
+/* More flags may be defined later, this spec will be updated. */
+</pre>
+* The <code>maxAge</code> argument is the maximum age in seconds of data to clear, inclusive. If <code>maxAge</code> is <code>0</code>, no data is cleared. If <code>maxAge</code> is the maximum unsigned 64-bit integer, all data is cleared.
-=== Site/URI ===
+The following new <code>NPError</code> values will be available for return from <code>NPP_ClearSiteData</code>:
-= Current Proposal =
+<pre>
+// can't clear by time range
+#define NPERR_TIME_RANGE_NOT_SUPPORTED (NPERR_BASE + 14)
+// malformed 'site' string
+#define NPERR_MALFORMED_SITE (NPERR_BASE + 15)
+</pre>
+For any other type of error the plugin must return <code>NPERR_GENERIC_ERROR</code>.
+If site data is in use by an instance of the plugin when <code>NPP_ClearSiteData</code> is called then it is up to the plugin to do the right thing.
+= Notes =
+Notes for this specification are [[NPAPI:ClearPrivateDataNotes|here]].