webxdc (#2174)

* add new w30 APIs

* create the webview,
disable internet access,
inject deltachat.js

* connect deltachat to the webview

* promisify api

* use msgActionButton to start the w30 apps

* cleanup

- create observers in onCreate() to avoid memory leak,
- derive from WebViewActivity to easier deal with particularities
  and to saves >100 loc
- reorder some methods to reflect lifetimes

* make it more clear, which uri-part is 'domain' and which one is 'path'

* unify logging

* it is 'statusUpdate' not 'stateUpdate'; not sure if promise is needed at the end, we can readd that as needed, simple code for now

* use core implementation for status updates

* disable debugging enabled by default, streamline code

* use same name for InternalJSApi for both, js and java

* getStatusUpdates() always return an array

* call JSON.stringify() on payload

* fix typo, fix equal operator

* use shorter function names in js land

* adapt to new zipped w30 format

* load any file from w30 archives

* add fallback if getMimeTypeFromExtension() fails

* rename w30 to webxdc

* add selfName()

* return selfAddr() if selfName() is empty

* rename deltachat.js to webxdc.js

* observer correct event

* rename getBlobFromArchive() to getWebxdcBlob()

* show webxdc app name in title bar

* swap payload and descr in sendUpdate() (adapt to new core api)

* allow user-defined-texts for webxdc apps, make room for icon+name

* show webxdc icon and name in chats

* render webxdc drafts accordingly

* allow configuring drafts

* do not destroy webxdc-message to be sent out by removing it via setDraft(null)

* fix crash when replying to webxdc messages

* add webxdc messages to profile's document tab

* hide 'search menu' for webxdc apps

* show app summary beside app icon

* remove outdated comment

* add precautious WebView restrictions

* Update src/org/thoughtcrime/securesms/ConversationItem.java

Co-authored-by: Asiel Díaz Benítez <adbenitez@nauta.cu>

* Update src/org/thoughtcrime/securesms/ConversationItem.java

Co-authored-by: Asiel Díaz Benítez <adbenitez@nauta.cu>

* Update src/org/thoughtcrime/securesms/ConversationActivity.java

Co-authored-by: Hocuri <hocuri@gmx.de>

* Webxdc requires at least Android 5 Lollipop

see https://github.com/deltachat/deltachat-android/pull/2174#discussion_r785436874

* recognize .xdc files on android10

based on @Hocuri's findings in #2188

Co-authored-by: Simon Laux <mobile.info@simonlaux.de>
Co-authored-by: adbenitez <asieldbenitez@gmail.com>
Co-authored-by: Asiel Díaz Benítez <adbenitez@nauta.cu>
Co-authored-by: Hocuri <hocuri@gmx.de>

jni/dc_wrapper.c

@@ -86,6 +86,19 @@ static jstring jstring_new__(JNIEnv* env, const char* a)
 #define CTIMESTAMP(a) (((jlong)a)/((jlong)1000))
 
 
+static jbyteArray ptr2jbyteArray(JNIEnv *env, const void* ptr, size_t len) {
+    if (ptr == NULL || len <= 0) {
+        return NULL;
+    }
+    jbyteArray ret = (*env)->NewByteArray(env, len);
+    if (ret == NULL) {
+        return NULL;
+    }
+    (*env)->SetByteArrayRegion(env, ret, 0, len, (const jbyte*)ptr);
+    return ret;
+}
+
+
 static jintArray dc_array2jintArray_n_unref(JNIEnv *env, dc_array_t* ca)
 {
     /* takes a C-array of type dc_array_t and converts it it a Java-Array.
@@ -704,6 +717,26 @@ JNIEXPORT jint Java_com_b44t_messenger_DcContext_sendVideochatInvitation(JNIEnv
 }
 
 
+JNIEXPORT jboolean Java_com_b44t_messenger_DcContext_sendWebxdcStatusUpdate(JNIEnv *env, jobject obj, jint msg_id, jstring payload, jstring descr)
+{
+    CHAR_REF(payload);
+    CHAR_REF(descr);
+        jboolean ret = dc_send_webxdc_status_update(get_dc_context(env, obj), msg_id, payloadPtr, descrPtr) != 0;
+    CHAR_UNREF(descr);
+    CHAR_UNREF(payload);
+    return ret;
+}
+
+
+JNIEXPORT jstring Java_com_b44t_messenger_DcContext_getWebxdcStatusUpdates(JNIEnv *env, jobject obj, jint msg_id, jint status_update_id)
+{
+    char* temp = dc_get_webxdc_status_updates(get_dc_context(env, obj), msg_id, status_update_id);
+        jstring ret = JSTRING_NEW(temp);
+    dc_str_unref(temp);
+    return ret;
+}
+
+
 JNIEXPORT jint Java_com_b44t_messenger_DcContext_addDeviceMsg(JNIEnv *env, jobject obj, jstring label, jobject msg)
 {
     CHAR_REF(label);
@@ -1528,6 +1561,28 @@ JNIEXPORT jstring Java_com_b44t_messenger_DcMsg_getFilename(JNIEnv *env, jobject
 }
 
 
+JNIEXPORT jbyteArray Java_com_b44t_messenger_DcMsg_getWebxdcBlob(JNIEnv *env, jobject obj, jstring filename)
+{
+    jbyteArray ret = NULL;
+    CHAR_REF(filename)
+        size_t ptrSize = 0;
+        char* ptr = dc_msg_get_webxdc_blob(get_dc_msg(env, obj), filenamePtr, &ptrSize);
+        ret = ptr2jbyteArray(env, ptr, ptrSize);
+        dc_str_unref(ptr);
+    CHAR_UNREF(filename)
+    return ret;
+}
+
+
+JNIEXPORT jstring Java_com_b44t_messenger_DcMsg_getWebxdcInfoJson(JNIEnv *env, jobject obj)
+{
+    char* temp = dc_msg_get_webxdc_info(get_dc_msg(env, obj));
+        jstring ret =  JSTRING_NEW(temp);
+    dc_str_unref(temp);
+    return ret;
+}
+
+
 JNIEXPORT jboolean Java_com_b44t_messenger_DcMsg_isForwarded(JNIEnv *env, jobject obj)
 {
     return dc_msg_is_forwarded(get_dc_msg(env, obj))!=0;