Merge pull request #514 from Deltares/513-add-required-uid-to-cds-api…

…-key-for-era5-download

check for colon in cds apikey

dfm_tools/download.py

@@ -151,8 +151,10 @@ def cds_credentials():
     if os.path.exists(file_credentials):
         print('found CDS apikey')
     else:
-        print("Downloading CDS/ERA5 data requires a CDS apikey, copy the key from https://cds.climate.copernicus.eu/api-how-to (first register and sign in) ")
-        apikey = getpass.getpass("Enter your CDS apikey: ")
+        print("Downloading CDS/ERA5 data requires a CDS API key, copy the key from https://cds.climate.copernicus.eu/api-how-to (first register and sign in) ")
+        apikey = getpass.getpass("\nEnter your CDS API Key: ")
+        if ":" not in apikey:
+            raise ValueError('A ":"-symbol is missing in the provided key (format should be "UID:apikey"). Please check the instructions above again.')
         with open(file_credentials,'w') as fc:
             fc.write('url: https://cds.climate.copernicus.eu/api/v2\n')
             fc.write(f'key: {apikey}')