Merge pull request #43 from DataManagementLab/#26_pdf

#26 pdf

Author: bhaettasch

README.md

@@ -20,6 +20,7 @@ Collab Coursebook has two types of requirements: System requirements are depende
 
 * Python 3.6 incl. development tools
 * Virtualenv
+* poppler
 * for production using uwsgi:
   * C compiler e.g. gcc
   * uwsgi

collab_coursebook/settings.py

@@ -17,6 +17,8 @@
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 
+## Allow Pdf Previewer
+X_FRAME_OPTIONS = 'SAMEORIGIN'
 
 # Quick-start development settings - unsuitable for production
 # See https://docs.djangoproject.com/en/3.0/howto/deployment/checklist/

content/admin.py

@@ -1,6 +1,6 @@
 from django.contrib import admin
 
-from content.models import YTVideoContent, ImageContent
+from content.models import YTVideoContent, ImageContent, PdfContent
 
 
 @admin.register(YTVideoContent)
@@ -11,3 +11,8 @@ class YTVideoContentAdmin(admin.ModelAdmin):
 @admin.register(ImageContent)
 class ImageContentAdmin(admin.ModelAdmin):
     pass
+
+
+@admin.register(PdfContent)
+class PdfContentAdmin(admin.ModelAdmin):
+    pass

content/forms.py

@@ -1,5 +1,5 @@
 from django import forms
-from content.models import YTVideoContent, ImageContent
+from content.models import YTVideoContent, ImageContent, PdfContent
 
 
 class AddContentFormYoutubeVideo(forms.ModelForm):
@@ -14,7 +14,14 @@ class Meta:
         exclude = ['content']
 
 
+class AddContentFormPdf(forms.ModelForm):
+    class Meta:
+        model = PdfContent
+        exclude = ['content']
+
+
 CONTENT_TYPE_FORMS = {
     YTVideoContent.TYPE: AddContentFormYoutubeVideo,
     ImageContent.TYPE: AddContentFormImage,
+    PdfContent.TYPE: AddContentFormPdf
 }

content/migrations/0004_pdfcontent.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.0.4 on 2020-06-22 15:33
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('base', '0010_favorite'),
+        ('content', '0003_license_verbose_name'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='PdfContent',
+            fields=[
+                ('content', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, primary_key=True, serialize=False, to='base.Content', verbose_name='Content')),
+                ('pdf', models.ImageField(upload_to='uploads/contents/%Y/%m/%d/', verbose_name='pdf')),
+                ('source', models.TextField(verbose_name='Source')),
+                ('license', models.CharField(blank=True, max_length=200, verbose_name='License')),
+            ],
+            options={
+                'verbose_name': 'Pdf Content',
+                'verbose_name_plural': 'Pdf Contents',
+            },
+        ),
+    ]

content/migrations/0005_auto_20200729_1405.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.4 on 2020-07-29 14:05
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('content', '0004_pdfcontent'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='pdfcontent',
+            name='pdf',
+            field=models.FileField(upload_to='uploads/contents/%Y/%m/%d/', verbose_name='Pdf'),
+        ),
+    ]

content/mixin.py

@@ -0,0 +1,7 @@
+
+class GeneratePreviewMixin:
+    """
+    Provides method to generate Preview Images
+    """
+    def generate_preview(self):
+        return

content/models.py

@@ -1,7 +1,18 @@
+import os
+
 from django.db import models
 from django.utils.translation import gettext_lazy as _
-
 from base.models import Content
+from content.mixin import GeneratePreviewMixin
+from pdf2image import convert_from_path, convert_from_bytes
+from PIL import Image
+from pdf2image.exceptions import (
+    PDFInfoNotInstalledError,
+    PDFPageCountError,
+    PDFSyntaxError
+)
+
+from django.conf import settings
 
 
 class YTVideoContent(models.Model):
@@ -15,6 +26,9 @@ class Meta:
     content = models.OneToOneField(Content, verbose_name=_("Content"), on_delete=models.CASCADE, primary_key=True)
     url = models.URLField(verbose_name=_("Video URL"))
 
+    def generate_preview(self):
+        return
+
     @property
     def id(self):
         return self.url.split("=")[1]
@@ -39,8 +53,42 @@ class Meta:
     def __str__(self):
         return f"{self.content}: {self.image}"
 
+    def generate_preview(self):
+        # TODO generate small image previews
+        return
+
+
+class PdfContent(models.Model, GeneratePreviewMixin):
+    TYPE = "Pdf"
+    DESC = _("Pdf")
+
+    class Meta:
+        verbose_name = _("Pdf Content")
+        verbose_name_plural = _("Pdf Contents")
+
+    content = models.OneToOneField(Content, verbose_name=_("Content"), on_delete=models.CASCADE, primary_key=True)
+    pdf = models.FileField(verbose_name=_("Pdf"), upload_to='uploads/contents/%Y/%m/%d/')
+    source = models.TextField(verbose_name=_("Source"))
+    license = models.CharField(verbose_name=_("License"), blank=True, max_length=200)
+
+    def generate_preview(self):
+        preview_folder = 'uploads/previews/'
+        # Check if Folder exists
+        if not os.path.exists(os.path.join(settings.MEDIA_ROOT,preview_folder)):
+            os.makedirs(os.path.join(settings.MEDIA_ROOT,preview_folder))
+        base_filename = os.path.splitext(os.path.basename(self.pdf.name))[0] + '.jpg'
+        # get images for every page
+        pages = convert_from_path(self.pdf.path, last_page=2)
+        # save first page to disk
+        pages[0].save(os.path.join(settings.MEDIA_ROOT,preview_folder, base_filename))
+        return os.path.join(preview_folder, base_filename)
+
+    def __str__(self):
+        return f"{self.content}: {self.pdf}"
+
 
 CONTENT_TYPES = {
     YTVideoContent.TYPE: YTVideoContent,
     ImageContent.TYPE: ImageContent,
+    PdfContent.TYPE: PdfContent
 }

content/templates/content/cards/Pdf.html

@@ -0,0 +1,3 @@
+
+
+<img class="card-img-top fit" style="height: 180px;" src="{% if content.preview %}{{content.preview.url}}{% endif %}" alt="{{ content.description }}" width="500" height="600">

content/templates/content/view/Pdf.html

@@ -0,0 +1,19 @@
+{% load i18n %}
+
+
+
+<div class="row">
+    <div class="col">
+        <embed src="{{ content.pdfcontent.pdf.url }}" type="application/pdf" height="700px" width="100%">
+
+
+    </div>
+
+</div>
+<b>{% trans "Source" %}:</b>
+<p>{{ content.Pdfcontent.source }}</p>
+
+{% if content.Pdfcontent.license %}
+    <b>{% trans "License" %}:</b>
+    <p>{{ content.Pdfcontent.license }}</p>
+{% endif %}