[IMP] extract_api: improve implementation example

- Since the example only works for invoices, references to the other
  document types supported by the OCR have been removed.
- Handle the case where library `requests` isn't available.
- Show additional fields detected by the OCR.
- Properly set the ID of the JSON-RPC request.
- Commit 8c93ff7 should have adapted the implementation example with the
  latest API version.

X-original-commit: 56fa6da441
Part-of: odoo/documentation#12284
Signed-off-by: Louis Baudoux (lba) <lba@odoo.com>

content/developer/reference/extract_api/implementation.py

@@ -2,27 +2,25 @@ import base64
 import json
 import sys
 import time
+import uuid
 
-import requests
+try:
+    import requests
+except ImportError:
+    print("The 'requests' library is required to run this script. More information at https://pypi.org/project/requests.")
+    exit()
 
 account_token = "integration_token"  # Use your token
 domain_name = "https://extract.api.odoo.com"
 path_to_pdf = "/path/to/your/pdf"
-doc_type = "invoice"  # invoice, expense or applicant
 
-# Do not change
-API_VERSION = {
-    'invoice': 122,
-    'expense': 132,
-    'applicant': 102,
-}
 
 def extract_jsonrpc_call(path: str, params: dict):
     payload = {
         'jsonrpc': '2.0',
         'method': 'call',
         'params': params,
-        'id': 0,  # This should be unique for each call
+        'id': uuid.uuid4().hex,  # This should be unique for each call
     }
     response = requests.post(domain_name + path, json=payload, timeout=10)
     response.raise_for_status()
@@ -35,20 +33,20 @@ def send_document_to_extract(doc_path: str):
         encoded_doc = base64.b64encode(f.read()).decode()
     params = {
         'account_token': account_token,
-        'version': API_VERSION[doc_type],
+        'version': 123,
         'documents': [encoded_doc],
     }
-    response = extract_jsonrpc_call(f"/api/extract/{doc_type}/2/parse", params)
+    response = extract_jsonrpc_call(f"/api/extract/invoice/2/parse", params)
     return response
 
 
 def get_result_from_extract(document_token: str):
     params = {
-        'version': API_VERSION[doc_type],
+        'version': 123,
         'document_token': document_token,
         'account_token': account_token,
     }
-    endpoint = f"/api/extract/{doc_type}/2/get_result"
+    endpoint = f"/api/extract/invoice/2/get_result"
     response = extract_jsonrpc_call(endpoint, params)
     while response['result']['status'] == 'processing':
         print("Still processing... Retrying in 5 seconds")
@@ -83,8 +81,14 @@ if __name__ == '__main__':
 
     document_results = response['result']['results'][0]
 
-    print("\nTotal:", document_results['total']['selected_value']['content'])
-    print("Subtotal:", document_results['subtotal']['selected_value']['content'])
-    print("Invoice id:", document_results['invoice_id']['selected_value']['content'])
-    print("Date:", document_results['date']['selected_value']['content'])
-    print("...\n")
+
+    def _get_selected_value(field):
+        return document_results.get(field, {}).get('selected_value', {}).get('content', '')
+
+
+    print("\nTotal:", _get_selected_value('total'))
+    print("Subtotal:", _get_selected_value('subtotal'))
+    print("Reference:", _get_selected_value('invoice_id'))
+    print("Date:", _get_selected_value('date'))
+    print("Due date:", _get_selected_value('due_date'))
+    print("Currency:", _get_selected_value('currency'))