add function to get bearer token

maap-s3.py

@@ -33,6 +33,7 @@ def display_help():
     print('list       folder/path                                                List data in a subfolder')
     print('delete     path/in/S3/file.tiff                                       Delete an existing data on S3')
     print('refresh                                                               Refresh credentials and password')
+    print('token      email                        password                      Return a bearer token')
     print('resume                                                                Resume last interrupted multipart upload')
     sys.exit(2)
 
@@ -114,6 +115,23 @@ def generate_token(email, password):
         sys.exit(2)
 
 
+################################
+# Generate token and return it #
+###############################
+def get_token(email, password): 
+        
+    #print("[INFO] Start retrieving token for authent")
+    #Set the bearer
+    url = "https://iam."+MAAP_ENV_TYPE.lower()+".esa-maap.org/oxauth/restv1/token"
+    response = requests.post(url, data={'client_id': CLIENT_ID, 'username': email, 'password': password, "grant_type": "password", "scope": "openid+profile"})
+    #Convert the string to json to fecth access_token
+    data = json.loads(response.text)
+    token = data['access_token']
+    print (token)
+    return token
+
+
+
 #########################
 # Check if file is older#
 #########################
@@ -481,7 +499,7 @@ argv = sys.argv[1:]
 result=0
  
 try:
- 
+
     if len(argv) == 0:
         display_help()
     else:
@@ -501,6 +519,12 @@ try:
                 display_help()
             else:
                 delete(argv[1])
+        elif argv[0] == 'token':
+            # Delete a data
+            if len(argv) != 3:
+                display_help()
+            else:
+                get_token(argv[1], argv[2])  
         elif argv[0] == 'download':
             # Download a data
             if len(argv) != 3: