Question: Get annotations for methods

[12345qwert123456]

I'm trying to get annotations of methods that retrofit2 uses.
Here is an example code that was obtained using jadx-gui.

.method public abstract authAsync(Ljava/lang/String;)Lkotlinx/coroutines/Deferred;
    .annotation runtime Lretrofit2/http/Headers;
        value = {
            "Content-Type:application/json; charset=utf-8"
        }
    .end annotation
    
    .annotation runtime Lretrofit2/http/POST;
        value = "/api/auth"
    .end annotation
    
    .annotation build Lorg/jetbrains/annotations/NotNull;
    .end annotation

.end method

But I can't figure out how to get something similar using androguard.

>>> type(i)
<class 'androguard.core.analysis.analysis.ClassAnalysis'>
>>> i.get_methods()[0].get_method()
<androguard.core.bytecodes.dvm.EncodedMethod object at 0x0000025728DCBB10>
>>> i.get_methods()[0].get_method().get_information()
{}
>>> i.get_methods()[0].get_method().source()
public abstract kotlinx.coroutines.Deferred authAsync();
>>> i.get_methods()[0].get_method().get_instructions()
[]

I tried using the code from #175, but dvm.map_list.get_item_type("TYPE_ANNOTATIONS_DIRECTORY_ITEM") always return None.
Are there any methods to get annotation?

[ehrenb]

I think this is confusing because in the docstring, MapList.get_item_type(ttype) describes a string input for ttype, whereas it actually takes in a dex_types.TypeMapItem enum.

Try replacing:

dvm.map_list.get_item_type("TYPE_ANNOTATIONS_DIRECTORY_ITEM")

with:

from androguard.core.dex import (
        TypeMapItem)
...
dvm.map_list.get_item_type(TypeMapItem.ANNOTATIONS_DIRECTORY_ITEM)
...

Example:

from androguard.misc import AnalyzeAPK
from androguard.core.dex import (
        TypeMapItem)

fpath = 'tests/data/APK/TestActivity.apk'

a,d,dx = AnalyzeAPK(fpath)

for dvm in d:
    for adi in dvm.map_list.get_item_type(TypeMapItem.ANNOTATIONS_DIRECTORY_ITEM):
        if adi.get_method_annotations() == []:
            continue

        # Each annotations_directory_item contains many method_annotation
        for mi in adi.get_method_annotations():
            print(repr(dvm.get_method_by_idx(mi.get_method_idx())))

            # Each method_annotation stores an offset to annotation_set_item
            ann_set_item = dvm.CM.get_obj_by_offset(mi.get_annotations_off())

            # a annotation_set_item has an array of annotation_off_item
            for aoffitem in ann_set_item.get_annotation_off_item():

                # The annotation_off_item stores the offset to an annotation_item
                annotation_item = dvm.CM.get_obj_by_offset(aoffitem.get_annotation_off())

                # The annotation_item stores the visibility and a encoded_annotation
                # this encoded_annotation stores the type IDX, and an array of
                # annotation_element
                # these are again name idx and encoded_value's

                encoded_annotation = annotation_item.get_annotation()

                # Print the class type of the annotation
                print("@{}".format(dvm.CM.get_type(encoded_annotation.get_type_idx())))
                
                for annotation_element in encoded_annotation.get_elements():
                    print("   {} = {}".format(
                        dvm.CM.get_string(annotation_element.get_name_idx()),
                        # Read the EncodedValue and then the real value - which is again some object...
                        annotation_element.get_value().get_value(),
                        ))


            print()

output snippet

...
<androguard.core.dex.EncodedMethod object at 0x7fdee62dfb80>
@Ldalvik/annotation/Throws;
   value = <androguard.core.dex.EncodedArray object at 0x7fdee5fba800>

<androguard.core.dex.EncodedMethod object at 0x7fdee6104d00>
@Ldalvik/annotation/Signature;
   value = <androguard.core.dex.EncodedArray object at 0x7fdee5f6b610>

<androguard.core.dex.EncodedMethod object at 0x7fdee6203c70>
@Ljava/lang/Deprecated;

<androguard.core.dex.EncodedMethod object at 0x7fdee6107bb0>
@Ldalvik/annotation/Signature;
   value = <androguard.core.dex.EncodedArray object at 0x7fdee5faca60>

<androguard.core.dex.EncodedMethod object at 0x7fdee6107be0>
@Ldalvik/annotation/Signature;
   value = <androguard.core.dex.EncodedArray object at 0x7fdee5f97a90>

<androguard.core.dex.EncodedMethod object at 0x7fdee621d0f0>
@Ldalvik/annotation/Signature;
   value = <androguard.core.dex.EncodedArray object at 0x7fdee5fac3a0>

<androguard.core.dex.EncodedMethod object at 0x7fdee621d4b0>
@Ldalvik/annotation/Signature;
   value = <androguard.core.dex.EncodedArray object at 0x7fdee5fa3ca0>

<androguard.core.dex.EncodedMethod object at 0x7fdee621d720>
@Ljava/lang/Deprecated;
...

[LeviKing98]

I also encountered the same problem. I want to use annotations to determine the type of generics.
However, I can only get the annotated type now.