piwigo: Add .images.add including form handling.

To make things a bit easier, switch to WTForms
for validating the received data.

mediagoblin/plugins/piwigo/forms.py

@@ -26,3 +26,19 @@ class AddSimpleForm(wtforms.Form):
     # tags = wtforms.FieldList(wtforms.TextField())
     category = wtforms.IntegerField()
     level = wtforms.IntegerField()
+
+
+_md5_validator = wtforms.validators.Regexp(r"^[0-9a-fA-F]{32}$")
+
+
+class AddForm(wtforms.Form):
+    original_sum = wtforms.TextField(None,
+        [_md5_validator,
+         wtforms.validators.Required()])
+    thumbnail_sum = wtforms.TextField(None,
+        [wtforms.validators.Optional(False),
+         _md5_validator])
+    file_sum = wtforms.TextField(None, [_md5_validator])
+    name = wtforms.TextField()
+    date_creation = wtforms.TextField()
+    categories = wtforms.TextField()

mediagoblin/plugins/piwigo/tools.py

@@ -18,7 +18,7 @@ import logging
 
 import six
 import lxml.etree as ET
-from werkzeug.exceptions import MethodNotAllowed
+from werkzeug.exceptions import MethodNotAllowed, BadRequest
 
 from mediagoblin.tools.response import Response
 
@@ -106,3 +106,16 @@ class CmdTable(object):
             _log.warn("Method %s only allowed for POST", cmd_name)
             raise MethodNotAllowed()
         return func
+
+
+def check_form(form):
+    if not form.validate():
+        _log.error("form validation failed for form %r", form)
+        for f in form:
+            if len(f.error):
+                _log.error("Errors for %s: %r", f.name, f.errors)
+        raise BadRequest()
+    dump = []
+    for f in form:
+        dump.append("%s=%r" % (f.name, f.data))
+    _log.debug("form: %s", " ".join(dump))

mediagoblin/plugins/piwigo/views.py

@@ -23,8 +23,8 @@ from werkzeug.wrappers import BaseResponse
 from mediagoblin import mg_globals
 from mediagoblin.meddleware.csrf import csrf_exempt
 from mediagoblin.submit.lib import check_file_field
-from .tools import CmdTable, PwgNamedArray, response_xml
+from .tools import CmdTable, PwgNamedArray, response_xml, check_form
-from .forms import AddSimpleForm
+from .forms import AddSimpleForm, AddForm
 
 
 _log = logging.getLogger(__name__)
@@ -133,6 +133,15 @@ def pwg_images_addChunk(request):
     return True
 
 
+@CmdTable("pwg.images.add", True)
+def pwg_images_add(request):
+    _log.info("add: %r", request.form)
+    form = AddForm(request.form)
+    check_form(form)
+
+    return {'image_id': 123456, 'url': ''}
+
+
 @csrf_exempt
 def ws_php(request):
     if request.method not in ("GET", "POST"):