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[redakcja.git] / apps / api / handlers / library_handlers.py
diff --git a/apps/api/handlers/library_handlers.py b/apps/api/handlers/library_handlers.py
index b47d41c..84881ce 100644 (file)
--- a/apps/api/handlers/library_handlers.py
+++ b/apps/api/handlers/library_handlers.py
@@ -1,75 +1,149 @@
 # -*- encoding: utf-8 -*-
 # -*- encoding: utf-8 -*-
+import os.path
+import logging
 
 __author__= "Łukasz Rekucki"
 __date__ = "$2009-09-25 15:49:50$"
 __doc__ = "Module documentation."
 
 from piston.handler import BaseHandler, AnonymousBaseHandler
 
 __author__= "Łukasz Rekucki"
 __date__ = "$2009-09-25 15:49:50$"
 __doc__ = "Module documentation."
 
 from piston.handler import BaseHandler, AnonymousBaseHandler
-from piston.utils import rc
 
 
-import settings
-import librarian
-import api.forms as forms
+import re
 from datetime import date
 
 from django.core.urlresolvers import reverse
 from datetime import date
 
 from django.core.urlresolvers import reverse
-from wlrepo import MercurialLibrary, RevisionNotFound
+from django.utils import simplejson as json
 
 
+import librarian
+import librarian.html
 from librarian import dcparser
 
 from librarian import dcparser
 
+from wlrepo import *
+from explorer.models import PullRequest, GalleryForDocument
+
+# internal imports
+import api.forms as forms
+import api.response as response
+from api.utils import validate_form, hglibrary, natural_order
+from api.models import PartCache
+
+#
+import settings
+
+
+log = logging.getLogger('platforma.api')
+
+
 #
 # Document List Handlers
 #
 class BasicLibraryHandler(AnonymousBaseHandler):
     allowed_methods = ('GET',)
 
 #
 # Document List Handlers
 #
 class BasicLibraryHandler(AnonymousBaseHandler):
     allowed_methods = ('GET',)
 
-    def read(self, request):
-        """Return the list of documents."""
-        lib = MercurialLibrary(path=settings.REPOSITORY_PATH)
-
+    @hglibrary
+    def read(self, request, lib):
+        """Return the list of documents."""       
         document_list = [{
             'url': reverse('document_view', args=[docid]),
             'name': docid } for docid in lib.documents() ]
 
         return {'documents' : document_list}
         document_list = [{
             'url': reverse('document_view', args=[docid]),
             'name': docid } for docid in lib.documents() ]
 
         return {'documents' : document_list}
+        
 
 class LibraryHandler(BaseHandler):
     allowed_methods = ('GET', 'POST')
     anonymous = BasicLibraryHandler
 
 
 class LibraryHandler(BaseHandler):
     allowed_methods = ('GET', 'POST')
     anonymous = BasicLibraryHandler
 
-    def read(self, request):
+    @hglibrary
+    def read(self, request, lib):
         """Return the list of documents."""
         """Return the list of documents."""
-        lib = MercurialLibrary(path=settings.REPOSITORY_PATH)
-
-        document_list = [{
-            'url': reverse('document_view', args=[docid]),
-            'name': docid } for docid in lib.documents() ]
-
-        return {'documents' : document_list }
-
-    def create(self, request):
-        """Create a new document."""
-        lib = MercurialLibrary(path=settings.REPOSITORY_PATH)
 
 
-        form = forms.DocumentUploadForm(request.POST, request.FILES)
-        if not form.is_valid():
-            return rc.BAD_REQUEST
-
-        f = request.FILES['ocr']
-        data = f.read().decode('utf-8')
+        documents = {}
+        
+        for docid in lib.documents():
+            docid = docid.decode('utf-8')
+            documents[docid] = {
+                'url': reverse('document_view', args=[docid]),
+                'name': docid,
+                'parts': []
+            }
+
+        parts = PartCache.objects.defer('part_id')\
+            .values_list('part_id', 'document_id').distinct()
+       
+        document_tree = dict(documents)
+
+        for part, docid in parts:
+            # this way, we won't display broken links
+            if not documents.has_key(part):
+                log.info("NOT FOUND: %s", part)
+                continue
+
+            parent = documents[docid]
+            child = documents[part]
+
+            # not top-level anymore
+            document_tree.pop(part)
+            parent['parts'].append(child)
+        
+        for doc in documents.itervalues():
+            doc['parts'].sort(key=natural_order(lambda d: d['name']))
+            
+        return {'documents': sorted(document_tree.itervalues(),
+            key=natural_order(lambda d: d['name']) ) }
+
+    @validate_form(forms.DocumentUploadForm, 'POST')
+    @hglibrary
+    def create(self, request, form, lib):
+        """Create a new document."""       
+
+        if form.cleaned_data['ocr_data']:
+            data = form.cleaned_data['ocr_data']
+        else:            
+            data = request.FILES['ocr_file'].read().decode('utf-8')
+
+        if data is None:
+            return response.BadRequest().django_response('You must pass ocr_data or ocr_file.')
 
         if form.cleaned_data['generate_dc']:
             data = librarian.wrap_text(data, unicode(date.today()))
 
 
         if form.cleaned_data['generate_dc']:
             data = librarian.wrap_text(data, unicode(date.today()))
 
-        # TODO: what if the file exists ?
-        doc = lib.document_create(form.cleaned_data['bookname'])
-        doc.quickwrite('xml', data, '$AUTO$ XML data uploaded.',
-            user=request.user.username)
+        docid = form.cleaned_data['bookname']
 
 
-        return {
-            'url': reverse('document_view', args=[doc.id]),
-            'name': doc.id,
-            'revision': doc.revision }
+        try:
+            lock = lib.lock()            
+            try:
+                log.info("DOCID %s", docid)
+                doc = lib.document_create(docid)
+                # document created, but no content yet
+
+                try:
+                    doc = doc.quickwrite('xml', data.encode('utf-8'),
+                        '$AUTO$ XML data uploaded.', user=request.user.username)
+                except Exception,e:
+                    import traceback
+                    # rollback branch creation
+                    lib._rollback()
+                    raise LibraryException(traceback.format_exc())
+
+                url = reverse('document_view', args=[doc.id])
+
+                return response.EntityCreated().django_response(\
+                    body = {
+                        'url': url,
+                        'name': doc.id,
+                        'revision': doc.revision },
+                    url = url )            
+            finally:
+                lock.release()
+        except LibraryException, e:
+            import traceback
+            return response.InternalError().django_response(\
+                {'exception': traceback.format_exc()} )
+        except DocumentAlreadyExists:
+            # Document is already there
+            return response.EntityConflict().django_response(\
+                {"reason": "Document %s already exists." % docid})
 
 #
 # Document Handlers
 
 #
 # Document Handlers
@@ -77,20 +151,19 @@ class LibraryHandler(BaseHandler):
 class BasicDocumentHandler(AnonymousBaseHandler):
     allowed_methods = ('GET',)
 
 class BasicDocumentHandler(AnonymousBaseHandler):
     allowed_methods = ('GET',)
 
-    def read(self, request, docid):
-        lib = MercurialLibrary(path=settings.REPOSITORY_PATH)
-
-        opts = forms.DocumentGetForm(request.GET)
-        if not opts.is_valid():
-            return rc.BAD_REQUEST
-
-        doc = lib.document(docid)
+    @hglibrary
+    def read(self, request, docid, lib):
+        try:    
+            doc = lib.document(docid)
+        except RevisionNotFound:
+            return rc.NOT_FOUND
 
         result = {
             'name': doc.id,
 
         result = {
             'name': doc.id,
+            'html_url': reverse('dochtml_view', args=[doc.id]),
             'text_url': reverse('doctext_view', args=[doc.id]),
             'text_url': reverse('doctext_view', args=[doc.id]),
-            'dc_url': reverse('docdc_view', docid=doc.id),
-            'latest_rev': doc.revision,
+            'dc_url': reverse('docdc_view', args=[doc.id]),
+            'public_revision': doc.revision,
         }
 
         return result
         }
 
         return result
@@ -102,75 +175,204 @@ class DocumentHandler(BaseHandler):
     allowed_methods = ('GET', 'PUT')
     anonymous = BasicDocumentHandler
 
     allowed_methods = ('GET', 'PUT')
     anonymous = BasicDocumentHandler
 
-    def read(self, request, docid):
-        """Read document's meta data"""
-        lib = MercurialLibrary(path=settings.REPOSITORY_PATH)
-
-        opts = forms.DocumentGetForm(request.GET)
-        if not opts.is_valid():
-            return rc.BAD_REQUEST
-
+    @hglibrary
+    def read(self, request, docid, lib):
+        """Read document's meta data"""       
+        log.info("Read %s", docid)
         try:
             doc = lib.document(docid)
             udoc = doc.take(request.user.username)
         try:
             doc = lib.document(docid)
             udoc = doc.take(request.user.username)
-        except RevisionNotFound:
-            return rc.NOT_HERE
+        except RevisionNotFound, e:
+            return response.EntityNotFound().django_response({
+                'exception': type(e), 'message': e.message})
 
         # is_shared = udoc.ancestorof(doc)
         # is_uptodate = is_shared or shared.ancestorof(document)
 
         result = {
             'name': udoc.id,
 
         # is_shared = udoc.ancestorof(doc)
         # is_uptodate = is_shared or shared.ancestorof(document)
 
         result = {
             'name': udoc.id,
+            'html_url': reverse('dochtml_view', args=[udoc.id]),
             'text_url': reverse('doctext_view', args=[udoc.id]),
             'dc_url': reverse('docdc_view', args=[udoc.id]),
             'text_url': reverse('doctext_view', args=[udoc.id]),
             'dc_url': reverse('docdc_view', args=[udoc.id]),
-            'parts_url': reverse('docparts_view', args=[udoc.id]),
-            'latest_rev': udoc.revision,
-            'latest_shared_rev': doc.revision,
-            # 'shared': is_shared,
-            # 'up_to_date': is_uptodate,
-        }
-
-        #if request.GET.get('with_part', 'no') == 'yes':
-        #    result['parts'] = document.parts()
+            'gallery_url': reverse('docgallery_view', args=[udoc.id]),
+            'merge_url': reverse('docmerge_view', args=[udoc.id]),
+            'user_revision': udoc.revision,
+            'user_timestamp': udoc.revision.timestamp,
+            'public_revision': doc.revision,
+            'public_timestamp': doc.revision.timestamp,
+        }       
 
         return result
 
 
         return result
 
+    @hglibrary
+    def update(self, request, docid, lib):
+        """Update information about the document, like display not"""
+        return
+#
+#
+#
+class DocumentHTMLHandler(BaseHandler):
+    allowed_methods = ('GET')
+
+    @hglibrary
+    def read(self, request, docid, lib):
+        """Read document as html text"""
+        try:
+            revision = request.GET.get('revision', 'latest')
+
+            if revision == 'latest':
+                document = lib.document(docid)
+            else:
+                document = lib.document_for_rev(revision)
+
+            if document.id != docid:
+                return response.BadRequest().django_response({'reason': 'name-mismatch',
+                    'message': 'Provided revision refers, to document "%s", but provided "%s"' % (document.id, docid) })
+
+            return librarian.html.transform(document.data('xml'), is_file=False, parse_dublincore=False)
+        except (EntryNotFound, RevisionNotFound), e:
+            return response.EntityNotFound().django_response({
+                'exception': type(e), 'message': e.message})
+
+
+#
+# Image Gallery
+#
+
+class DocumentGalleryHandler(BaseHandler):
+    allowed_methods = ('GET')
+    
+    def read(self, request, docid):
+        """Read meta-data about scans for gallery of this document."""
+        galleries = []
+
+        for assoc in GalleryForDocument.objects.filter(document=docid):
+            dirpath = os.path.join(settings.MEDIA_ROOT, assoc.subpath)
+
+            if not os.path.isdir(dirpath):
+                log.info(u"[WARNING]: missing gallery %s", dirpath)
+                continue
+
+            gallery = {'name': assoc.name, 'pages': []}
+            
+            for file in sorted(os.listdir(dirpath)):
+                log.info(file)
+                name, ext = os.path.splitext(os.path.basename(file))
+
+                if ext.lower() not in ['.png', '.jpeg', '.jpg']:
+                    log.info("Ignoring: %s %s", name, ext)
+                    continue
+
+                url = settings.MEDIA_URL + assoc.subpath + u'/' + file.decode('utf-8');
+                gallery['pages'].append(url)
+                
+            galleries.append(gallery)
+
+        return galleries                      
+
 #
 # Document Text View
 #
 #
 # Document Text View
 #
+
+XINCLUDE_REGEXP = r"""<(?:\w+:)?include\s+[^>]*?href=("|')wlrepo://(?P<link>[^\1]+?)\1\s*[^>]*?>"""
+#
+#
+#
 class DocumentTextHandler(BaseHandler):
 class DocumentTextHandler(BaseHandler):
-    allowed_methods = ('GET', 'PUT')
+    allowed_methods = ('GET', 'POST')
 
 
-    def read(self, request, docid):
+    @hglibrary
+    def read(self, request, docid, lib):
         """Read document as raw text"""
         """Read document as raw text"""
-        lib = MercurialLibrary(path=settings.REPOSITORY_PATH)
+        revision = request.GET.get('revision', 'latest')
         try:
         try:
-            return lib.document(docid, request.user.username).data('xml')
-        except RevisionNotFound:
-            return rc.NOT_HERE
-
-    def update(self, request, docid):
-        lib = MercurialLibrary(path=settings.REPOSITORY_PATH)
+            if revision == 'latest':
+                document = lib.document(docid)
+            else:
+                document = lib.document_for_rev(revision)
+
+            if document.id != docid:
+                return response.BadRequest().django_response({'reason': 'name-mismatch',
+                    'message': 'Provided revision is not valid for this document'})
+            
+            # TODO: some finer-grained access control
+            return document.data('xml')
+        except (EntryNotFound, RevisionNotFound), e:
+            return response.EntityNotFound().django_response({
+                'exception': type(e), 'message': e.message})
+
+    @hglibrary
+    def create(self, request, docid, lib):
         try:
         try:
-            data = request.PUT['contents']
-            prev = request.PUT['revision']
+            data = request.POST['contents']
+            revision = request.POST['revision']
 
 
-            if request.PUT.has_key('message'):
-                msg = u"$USER$ " + request.PUT['message']
+            if request.POST.has_key('message'):
+                msg = u"$USER$ " + request.POST['message']
             else:
                 msg = u"$AUTO$ XML content update."
 
             current = lib.document(docid, request.user.username)
             else:
                 msg = u"$AUTO$ XML content update."
 
             current = lib.document(docid, request.user.username)
-            orig = lib.document_for_rev(prev)
+            orig = lib.document_for_rev(revision)
 
             if current != orig:
 
             if current != orig:
-                return rc.DUPLICATE_ENTRY
+                return response.EntityConflict().django_response({
+                        "reason": "out-of-date",
+                        "provided_revision": orig.revision,
+                        "latest_revision": current.revision })
+
+            # try to find any Xinclude tags
+            includes = [m.groupdict()['link'] for m in (re.finditer(\
+                XINCLUDE_REGEXP, data, flags=re.UNICODE) or []) ]
+
+            log.info("INCLUDES: %s", includes)
+
+            # TODO: provide useful routines to make this simpler
+            def xml_update_action(lib, resolve):
+                try:
+                    f = lib._fileopen(resolve('parts'), 'r')
+                    stored_includes = json.loads(f.read())
+                    f.close()
+                except:
+                    stored_includes = []
+                
+                if stored_includes != includes:
+                    f = lib._fileopen(resolve('parts'), 'w+')
+                    f.write(json.dumps(includes))
+                    f.close()
+
+                    lib._fileadd(resolve('parts'))
+
+                    # update the parts cache
+                    PartCache.update_cache(docid, current.owner,\
+                        stored_includes, includes)
+
+                # now that the parts are ok, write xml
+                f = lib._fileopen(resolve('xml'), 'w+')
+                f.write(data.encode('utf-8'))
+                f.close()
+
+            ndoc = None
+            ndoc = current.invoke_and_commit(\
+                xml_update_action, lambda d: (msg, current.owner) )
+
+            try:
+                # return the new revision number
+                return response.SuccessAllOk().django_response({
+                    "document": ndoc.id,
+                    "subview": "xml",
+                    "previous_revision": current.revision,
+                    "revision": ndoc.revision,
+                    'timestamp': ndoc.revision.timestamp,
+                    "url": reverse("doctext_view", args=[ndoc.id])
+                })
+            except Exception, e:
+                if ndoc: lib._rollback()
+                raise e        
+        except RevisionNotFound, e:
+            return response.EntityNotFound(mimetype="text/plain").\
+                django_response(e.message)
 
 
-            doc.quickwrite('xml', data, msg)
-
-            return rc.ALL_OK
-        except (RevisionNotFound, KeyError):
-            return rc.NOT_HERE
 
 #
 # Dublin Core handlers
 
 #
 # Dublin Core handlers
@@ -178,42 +380,153 @@ class DocumentTextHandler(BaseHandler):
 # @requires librarian
 #
 class DocumentDublinCoreHandler(BaseHandler):
 # @requires librarian
 #
 class DocumentDublinCoreHandler(BaseHandler):
-    allowed_methods = ('GET', 'PUT')
+    allowed_methods = ('GET', 'POST')
 
 
-    def read(self, request, docid):
-        """Read document as raw text"""
-        lib = MercurialLibrary(path=settings.REPOSITORY_PATH)
+    @hglibrary
+    def read(self, request, docid, lib):
+        """Read document as raw text"""        
         try:
         try:
-            doc = lib.document(docid, request.user.username).data('xml')
-            bookinfo = dcparser.BookInfo.from_string(doc.read())
+            revision = request.GET.get('revision', 'latest')
 
 
+            if revision == 'latest':
+                doc = lib.document(docid)
+            else:
+                doc = lib.document_for_rev(revision)
+
+
+            if document.id != docid:
+                return response.BadRequest().django_response({'reason': 'name-mismatch',
+                    'message': 'Provided revision is not valid for this document'})
+            
+            bookinfo = dcparser.BookInfo.from_string(doc.data('xml'))
             return bookinfo.serialize()
             return bookinfo.serialize()
-        except RevisionNotFound:
-            return rc.NOT_HERE
+        except (EntryNotFound, RevisionNotFound), e:
+            return response.EntityNotFound().django_response({
+                'exception': type(e), 'message': e.message})
 
 
-    def update(self, request, docid):
-        lib = MercurialLibrary(path=settings.REPOSITORY_PATH)
+    @hglibrary
+    def create(self, request, docid, lib):
         try:
         try:
-            bi_json = request.PUT['contents']
-            prev = request.PUT['revision']
-            if request.PUT.has_key('message'):
+            bi_json = request.POST['contents']
+            revision = request.POST['revision']
+            
+            if request.POST.has_key('message'):
                 msg = u"$USER$ " + request.PUT['message']
             else:
                 msg = u"$AUTO$ Dublin core update."
 
             current = lib.document(docid, request.user.username)
                 msg = u"$USER$ " + request.PUT['message']
             else:
                 msg = u"$AUTO$ Dublin core update."
 
             current = lib.document(docid, request.user.username)
-            orig = lib.document_for_rev(prev)
+            orig = lib.document_for_rev(revision)
 
             if current != orig:
 
             if current != orig:
-                return rc.DUPLICATE_ENTRY
+                return response.EntityConflict().django_response({
+                        "reason": "out-of-date",
+                        "provided": orig.revision,
+                        "latest": current.revision })
 
             xmldoc = parser.WLDocument.from_string(current.data('xml'))
             document.book_info = dcparser.BookInfo.from_json(bi_json)
 
             # zapisz
 
             xmldoc = parser.WLDocument.from_string(current.data('xml'))
             document.book_info = dcparser.BookInfo.from_json(bi_json)
 
             # zapisz
-            current.quickwrite('xml', document.serialize().encode('utf-8'),\
+            ndoc = current.quickwrite('xml', \
+                document.serialize().encode('utf-8'),\
                 message=msg, user=request.user.username)
 
                 message=msg, user=request.user.username)
 
-            return rc.ALL_OK
-        except (RevisionNotFound, KeyError):
-            return rc.NOT_HERE
+            try:
+                # return the new revision number
+                return {
+                    "document": ndoc.id,
+                    "subview": "dc",
+                    "previous_revision": current.revision,
+                    "revision": ndoc.revision,
+                    'timestamp': ndoc.revision.timestamp,
+                    "url": reverse("docdc_view", args=[ndoc.id])
+                }
+            except Exception, e:
+                if ndoc: lib._rollback()
+                raise e
+        except RevisionNotFound:
+            return response.EntityNotFound().django_response()
+
+class MergeHandler(BaseHandler):
+    allowed_methods = ('POST',)
+
+    @validate_form(forms.MergeRequestForm, 'POST')
+    @hglibrary
+    def create(self, request, form, docid, lib):
+        """Create a new document revision from the information provided by user"""
+
+        target_rev = form.cleaned_data['target_revision']
+
+        doc = lib.document(docid)
+        udoc = doc.take(request.user.username)
+
+        if target_rev == 'latest':
+            target_rev = udoc.revision
+
+        if str(udoc.revision) != target_rev:
+            # user think doesn't know he has an old version
+            # of his own branch.
+            
+            # Updating is teorericly ok, but we need would
+            # have to force a refresh. Sharing may be not safe,
+            # 'cause it doesn't always result in update.
+
+            # In other words, we can't lie about the resource's state
+            # So we should just yield and 'out-of-date' conflict
+            # and let the client ask again with updated info.
+
+            # NOTE: this could result in a race condition, when there
+            # are 2 instances of the same user editing the same document.
+            # Instance "A" trying to update, and instance "B" always changing
+            # the document right before "A". The anwser to this problem is
+            # for the "A" to request a merge from 'latest' and then
+            # check the parent revisions in response, if he actually
+            # merge from where he thinks he should. If not, the client SHOULD
+            # update his internal state.
+            return response.EntityConflict().django_response({
+                    "reason": "out-of-date",
+                    "provided": target_rev,
+                    "latest": udoc.revision })
+
+        if not request.user.has_perm('explorer.book.can_share'):
+            # User is not permitted to make a merge, right away
+            # So we instead create a pull request in the database
+            prq = PullRequest(
+                comitter=request.user,
+                document=docid,
+                source_revision = str(udoc.revision),
+                status="N",
+                comment = form.cleaned_data['message'] or '$AUTO$ Document shared.'
+            )
+
+            prq.save()
+            return response.RequestAccepted().django_response(\
+                ticket_status=prq.status, \
+                ticket_uri=reverse("pullrequest_view", args=[prq.id]) )
+
+        if form.cleaned_data['type'] == 'update':
+            # update is always performed from the file branch
+            # to the user branch
+            success, changed = udoc.update(request.user.username)
+
+        if form.cleaned_data['type'] == 'share':
+            success, changed = udoc.share(form.cleaned_data['message'])
+
+        if not success:
+            return response.EntityConflict().django_response({
+                'reason': 'merge-failure',
+            })
+
+        if not changed:
+            return response.SuccessNoContent().django_response()
+
+        nudoc = udoc.latest()
+
+        return response.SuccessAllOk().django_response({
+            "name": nudoc.id,
+            "parent_user_resivion": udoc.revision,
+            "parent_revision": doc.revision,
+            "revision": nudoc.revision,
+            'timestamp': nudoc.revision.timestamp,
+        })