esim/http_json_api: allow URL rewriting

The URL used when HTTP requests are performed is defined statically
with the url_prefix passed to the constructor of JsonHttpApiClient
together with the path property in JsonHttpApiFunction.

For applications that require dynamic URLs there is no way to rewrite
the URL. Let's add a mechanism that allows API users to apply custom
URL reqriting rules by adding a rewrite_url method to
JsonHttpApiFunction. API users may then overload this method with a
custom implementation as needed.

Related: SYS#7918
Change-Id: Id2713a867079cc140517fe312189e5e2162608a5

pySim/cdma_ruim.py

@@ -128,7 +128,7 @@ class EF_AD(TransparentEF):
         cell_test = 0x04
 
     def __init__(self, fid='6f43', sfid=None, name='EF.AD',
-                 desc='Service Provider Name', size=(3, None), **kwargs):
+                 desc='Administrative Data', size=(3, None), **kwargs):
         super().__init__(fid, sfid=sfid, name=name, desc=desc, size=size, **kwargs)
         self._construct = Struct(
             # Byte 1: Display Condition

pySim/esim/http_json_api.py

@@ -19,7 +19,7 @@ import abc
 import requests
 import logging
 import json
-from typing import Optional
+from typing import Optional, Tuple
 import base64
 from twisted.web.server import Request
 
@@ -180,7 +180,7 @@ class JsonHttpApiFunction(abc.ABC):
     # receives from the a requesting client. The same applies vice versa to class variables that have an "output_"
     # prefix.
 
-    # path of the API function (e.g. '/gsma/rsp2/es2plus/confirmOrder')
+    # path of the API function (e.g. '/gsma/rsp2/es2plus/confirmOrder', see also method rewrite_url).
     path = None
 
     # dictionary of input parameters. key is parameter name, value is ApiParam class
@@ -336,6 +336,22 @@ class JsonHttpApiFunction(abc.ABC):
                 output[p] = p_class.decode(v)
         return output
 
+    def rewrite_url(self, data: dict, url: str) -> Tuple[dict, str]:
+        """
+        Rewrite a static URL using information passed in the data dict. This method may be overloaded by a derived
+        class to allow fully dynamic URLs. The input parameters required for the URL rewriting may be passed using
+        data parameter. In case those parameters are additional parameters that are not intended to be passed to
+        the encode_client method later, they must be removed explcitly.
+
+        Args:
+                data: (see JsonHttpApiClient and JsonHttpApiServer)
+                url: statically generated URL string (see comment in JsonHttpApiClient)
+        """
+
+        # This implementation is a placeholder in which we do not perform any URL rewriting. We just pass through data
+        # and url unmodified.
+        return data, url
+
 class JsonHttpApiClient():
     def __init__(self, api_func: JsonHttpApiFunction, url_prefix: str, func_req_id: Optional[str],
                  session: requests.Session):
@@ -352,8 +368,16 @@ class JsonHttpApiClient():
         self.session = session
 
     def call(self, data: dict, func_call_id: Optional[str] = None, timeout=10) -> Optional[dict]:
-        """Make an API call to the HTTP API endpoint represented by this object. Input data is passed in `data` as
+        """
-        json-serializable dict. Output data is returned as json-deserialized dict."""
+        Make an API call to the HTTP API endpoint represented by this object. Input data is passed in `data` as
+        json-serializable fields. `data` may also contain additional parameters required for URL rewriting (see
+        rewrite_url in class JsonHttpApiFunction). Output data is returned as json-deserialized dict.
+
+        Args:
+                data: Input data required to perform the request.
+                func_call_id: Function Call Identifier, if present a header field is generated automatically.
+                timeout: Maximum amount of time to wait for the request to complete.
+        """
 
         # In case a function caller ID is supplied, use it together with the stored function requestor ID to generate
         # and prepend the header field according to SGP.22, section 6.5.1.1 and 6.5.1.3. (the presence of the header
@@ -362,6 +386,11 @@ class JsonHttpApiClient():
             data = {'header' : {'functionRequesterIdentifier': self.func_req_id,
                                 'functionCallIdentifier': func_call_id}} | data
 
+        # The URL used for the HTTP request (see below) normally consists of the initially given url_prefix
+        # concatenated with the path defined by the JsonHttpApiFunction definition. This static URL path may be
+        # rewritten by rewrite_url method defined in the JsonHttpApiFunction.
+        data, url = self.api_func.rewrite_url(data, self.url_prefix + self.api_func.path)
+
         # Encode the message (the presence of mandatory fields is checked during encoding)
         encoded = json.dumps(self.api_func.encode_client(data))
 
@@ -373,7 +402,6 @@ class JsonHttpApiClient():
         req_headers.update(self.api_func.extra_http_req_headers)
 
         # Perform HTTP request
-        url = self.url_prefix + self.api_func.path
         logger.debug("HTTP REQ %s - hdr: %s '%s'" % (url, req_headers, encoded))
         response = self.session.request(self.api_func.http_method, url, data=encoded, headers=req_headers, timeout=timeout)
         logger.debug("HTTP RSP-STS: [%u] hdr: %s" % (response.status_code, response.headers))

pySim/esim/saip/__init__.py

@@ -151,6 +151,8 @@ class File:
         self.df_name = None
         self.fill_pattern = None
         self.fill_pattern_repeat = False
+        self.pstdo = None # pinStatusTemplateDO, mandatory for DF/ADF
+        self.lcsi = None # optional life cycle status indicator
         # apply some defaults from profile
         if self.template:
             self.from_template(self.template)
@@ -278,6 +280,8 @@ class File:
         elif self.file_type in ['MF', 'DF', 'ADF']:
             fdb_dec['file_type'] = 'df'
             fdb_dec['structure'] = 'no_info_given'
+            # pinStatusTemplateDO is mandatory for DF/ADF
+            fileDescriptor['pinStatusTemplateDO'] = self.pstdo
         # build file descriptor based on above input data
         fd_dict = {}
         if len(fdb_dec):
@@ -304,6 +308,8 @@ class File:
             # desired fill or repeat pattern in the "proprietaryEFInfo" element for the EF in Profiles
             # downloaded to a V2.2 or earlier eUICC.
             fileDescriptor['proprietaryEFInfo'] = pefi
+        if self.lcsi:
+            fileDescriptor['lcsi'] = self.lcsi
         logger.debug("%s: to_fileDescriptor(%s)" % (self, fileDescriptor))
         return fileDescriptor
 
@@ -323,6 +329,8 @@ class File:
         if efFileSize:
             self._file_size = self._decode_file_size(efFileSize)
 
+        self.pstdo = fileDescriptor.get('pinStatusTemplateDO', None)
+        self.lcsi = fileDescriptor.get('lcsi', None)
         pefi = fileDescriptor.get('proprietaryEFInfo', {})
         securityAttributesReferenced = fileDescriptor.get('securityAttributesReferenced', None)
         if securityAttributesReferenced: