diff --git a/app/api/__init__.py b/app/api/__init__.py
index 956c1b46..d397a93d 100644
--- a/app/api/__init__.py
+++ b/app/api/__init__.py
@@ -2,8 +2,25 @@
 """
 
 from flask import Blueprint
+from flask import request
 
 bp = Blueprint("api", __name__)
 
-from app.api import sco_api
+
+def requested_format(default_format="json", allowed_formats=None):
+    """Extract required format from query string.
+    * default value is json. A list of allowed formats may be provided
+    (['json'] considered if not provided).
+    * if the required format is not in allowed list, returns None.
+
+    NB: if json in not in allowed_formats, format specification is mandatory.
+    """
+    format_type = request.args.get("format", default_format)
+    if format_type in (allowed_formats or ["json"]):
+        return format_type
+    return None
+
+
 from app.api import tokens
+from app.api import sco_api
+from app.api import logos
diff --git a/app/api/sco_api.py b/app/api/sco_api.py
index 969753d1..6aa488c2 100644
--- a/app/api/sco_api.py
+++ b/app/api/sco_api.py
@@ -38,16 +38,15 @@
 # Scolarite/Notes/groups_view
 # Scolarite/Notes/moduleimpl_status
 # Scolarite/setGroups
+from datetime import datetime
 
-from flask import jsonify, request, url_for, abort, g
-from flask_login import current_user
+from flask import jsonify, request, g, send_file
 from sqlalchemy.sql import func
 
 from app import db, log
-from app.api import bp
+from app.api import bp, requested_format
 from app.api.auth import token_auth
-from app.api.errors import bad_request, error_response
-from app.decorators import permission_required
+from app.api.errors import error_response
 from app import models
 from app.models import FormSemestre, FormSemestreInscription, Identite
 from app.scodoc.sco_permissions import Permission
diff --git a/app/models/departements.py b/app/models/departements.py
index aa9c1006..95167383 100644
--- a/app/models/departements.py
+++ b/app/models/departements.py
@@ -42,3 +42,8 @@ class Departement(db.Model):
             "date_creation": self.date_creation,
         }
         return data
+
+    @classmethod
+    def from_acronym(cls, acronym):
+        dept = cls.query.filter_by(acronym=acronym).first_or_404()
+        return dept