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255 lines
10 KiB
Python
255 lines
10 KiB
Python
import io
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from pathlib import Path
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import django.forms as forms
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from django.http import JsonResponse
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from django.shortcuts import render
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from django.template import loader
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from django.urls import reverse
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from django.views.decorators.csrf import ensure_csrf_cookie
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from PIL import Image
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import piexif
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import troggle.settings as settings
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from troggle.core.utils import WriteAndCommitError, write_and_commit
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from .auth import login_required_if_public
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MAX_IMAGE_WIDTH = 1000
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MAX_IMAGE_HEIGHT = 800
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THUMBNAIL_WIDTH = 200
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THUMBNAIL_HEIGHT = 200
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"""This is all written by Martin Green, and completely undocumented.
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It uses a lot of opinionated Django default magic, none of which I am familiar with.
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Philip
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The function image_selector() is only called from a template file doing a popup input form,
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but it stores files directly in expoweb/i /l /t instead of in
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/expoweb/1623/2018-MS-01/i , /l, /t
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so ALL new caves have photos in the smae place, which makes the default upload EXTREMELY CONFUSING
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"""
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def get_dir(path):
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"From a path sent from urls.py, determine the directory."
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# todo re-write this to use modern pathlib functions
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if "/" in path:
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return path.rsplit("/", 1)[0]
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else:
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return ""
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def image_selector(request, path):
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"""Returns available images
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called from
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templates/html_editor_scripts_css.html: $('#image_popup_content').load("{% url 'image_selector' path %}" + path, function() {
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"""
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directory = get_dir(path)
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print(f" - image selector {directory=} {path=}")
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thumbnailspath = Path(settings.EXPOWEB) / directory / "t"
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thumbnails = []
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if thumbnailspath.is_dir():
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for f in thumbnailspath.iterdir():
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if f.is_file():
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if directory:
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base = f"{directory}/"
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else:
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base = ""
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thumbnail_url = reverse("expopage", args=[f"{base}t/{f.name}"])
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name_base = f.name.rsplit(".", 1)[0]
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page_path_base = Path(settings.EXPOWEB) / directory / "l"
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if (page_path_base / (f"{name_base}.htm")).is_file():
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page_url = reverse("expopage", args=[f"{base}l/{name_base}.htm"])
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else:
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page_url = reverse("expopage", args=[f"{base}l/{name_base}.html"])
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thumbnails.append({"thumbnail_url": thumbnail_url, "page_url": page_url})
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return render(request, "image_selector.html", {"thumbnails": thumbnails})
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def reorient_image(img, exif_dict):
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if piexif.ImageIFD.Orientation in exif_dict["0th"]:
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print(exif_dict)
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orientation = exif_dict["0th"].pop(piexif.ImageIFD.Orientation)
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if orientation == 2:
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img = img.transpose(Image.FLIP_LEFT_RIGHT)
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elif orientation == 3:
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img = img.rotate(180)
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elif orientation == 4:
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img = img.rotate(180).transpose(Image.FLIP_LEFT_RIGHT)
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elif orientation == 5:
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img = img.rotate(-90, expand=True).transpose(Image.FLIP_LEFT_RIGHT)
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elif orientation == 6:
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img = img.rotate(-90, expand=True)
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elif orientation == 7:
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img = img.rotate(90, expand=True).transpose(Image.FLIP_LEFT_RIGHT)
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elif orientation == 8:
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img = img.rotate(90, expand=True)
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return img
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@login_required_if_public
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@ensure_csrf_cookie
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def new_image_form(request, path):
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"""Manages a form to upload new images"""
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directory = get_dir(path)
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print(f"new_image_form(): {directory=} {path=}")
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if request.method == "POST":
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print(f"new_image_form(): POST ")
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form = NewWebImageForm(request.POST, request.FILES, directory=directory)
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if form.is_valid():
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print(f"new_image_form(): form is valid ")
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print(f"new_image_form(): files: {request.FILES['file_']}")
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f = request.FILES["file_"]
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binary_data = io.BytesIO()
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for chunk in f.chunks():
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binary_data.write(chunk)
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print(f"new_image_form(): binary chnks written")
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i = Image.open(binary_data)
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print(f"new_image_form(): {i=}")
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if "exif" in i.info:
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print(f"new_image_form(): exif: {i=}")
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exif_dict = piexif.load(i.info["exif"])
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i = reorient_image(i, exif_dict)
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exif_dict['Exif'][41729] = b'1'
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# can crash here with bad exif data
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try:
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exif = piexif.dump(exif_dict)
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except:
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exif = None
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else:
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exif = None
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print(f"new_image_form(): No exif problems")
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width, height = i.size
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print(f"new_image_form(): {i.size=}")
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if width > MAX_IMAGE_WIDTH or height > MAX_IMAGE_HEIGHT:
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print(f"new_image_form(): rescaling ")
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scale = max(width / MAX_IMAGE_WIDTH, height / MAX_IMAGE_HEIGHT)
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print(f"new_image_form(): rescaling {scale=}")
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try:
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i = i.resize((int(width / scale), int(height / scale)), Image.LANCZOS)
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except Exception as e:
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print(f"new_image_form(): rescaling exception: {e} ")
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print(f"new_image_form(): rescaled ")
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tscale = max(width / THUMBNAIL_WIDTH, height / THUMBNAIL_HEIGHT)
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thumbnail = i.resize((int(width / tscale), int(height / tscale)), Image.LANCZOS)
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ib = io.BytesIO()
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i = i.convert('RGB')
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i.save(ib, format="jpeg", quality = 75)
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tb = io.BytesIO()
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thumbnail = thumbnail.convert('RGB')
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thumbnail.save(tb, format="jpeg", quality = 70)
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image_rel_path, thumb_rel_path, desc_rel_path = form.get_rel_paths()
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print(f"new_image_form(): \n {image_rel_path=}\n {thumb_rel_path=}\n {desc_rel_path=}")
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image_page_template = loader.get_template("image_page_template.html") # this is the .html file in the /l/ folder
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image_page = image_page_template.render(
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{
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"header": form.cleaned_data["header"],
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"description": form.cleaned_data["description"],
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"photographer": form.cleaned_data["photographer"],
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"year": form.cleaned_data["year"],
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"filepath": f"/{image_rel_path}",
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}
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)
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image_path, thumb_path, desc_path = form.get_full_paths()
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# Create directories if required
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for full_path in image_path, thumb_path, desc_path:
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print(full_path, full_path.parent)
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full_path.parent.mkdir(parents=True, exist_ok=True)
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try:
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change_message = form.cleaned_data["change_message"]
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write_and_commit(
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[
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(desc_path, image_page, "utf-8"),
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(image_path, ib.getbuffer(), False),
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(thumb_path, tb.getbuffer(), False),
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],
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f"{change_message} - online adding of an image",
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)
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except WriteAndCommitError as e:
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print(f"new_image_form(): WriteAndCommitError: {e.message}")
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return JsonResponse({"error": e.message})
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except Exception as e:
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print(f"new_image_form(): EXCEPTION: {e.message}")
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return JsonResponse({"error": e.message})
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linked_image_template = loader.get_template("linked_image_template.html")
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html_snippet = linked_image_template.render(
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{"thumbnail_url": f"/{thumb_rel_path}", "page_url": f"/{desc_rel_path}"}, request
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)
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return JsonResponse({"html": html_snippet})
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else:
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print(f"new_image_form(): not POST ")
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form = NewWebImageForm(directory=directory)
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print(f"new_image_form(): POST and not POST ")
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template = loader.get_template("new_image_form.html")
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htmlform = template.render({"form": form, "path": path}, request)
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return JsonResponse({"form": htmlform})
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class NewWebImageForm(forms.Form):
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"""The form used by the editexpopage function"""
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header = forms.CharField(
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widget=forms.TextInput(
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attrs={"size": "60", "placeholder": "Enter title (displayed as a header and in the tab)"}
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)
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)
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file_ = forms.FileField()
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description = forms.CharField(
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widget=forms.Textarea(attrs={"cols": 80, "rows": 20, "placeholder": "Describe the photo (using HTML)"})
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)
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photographer = forms.CharField(
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widget=forms.TextInput(attrs={"size": "60", "placeholder": "Photographers name"}), required=False
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)
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year = forms.CharField(
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widget=forms.TextInput(attrs={"size": "60", "placeholder": "Year photo was taken"}), required=False
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)
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change_message = forms.CharField(
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widget=forms.Textarea(attrs={"cols": 80, "rows": 3, "placeholder": "Descibe the change made (for git)"})
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)
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def __init__(self, *args, **kwargs):
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self.directory = Path(kwargs.pop("directory"))
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super(forms.Form, self).__init__(*args, **kwargs)
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def get_rel_paths(self):
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f = self.cleaned_data["file_"]
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return [
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self.directory / "i" / (f.name.rsplit(".", 1)[0] + ".jpg"),
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self.directory / "t" / (f.name.rsplit(".", 1)[0] + ".jpg"),
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self.directory / "l" / (f.name.rsplit(".", 1)[0] + ".html"),
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]
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def get_full_paths(self):
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return [Path(settings.EXPOWEB) / x for x in self.get_rel_paths()] # this is where we would want to insert the /caveid/ ?!
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def clean_file_(self):
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for rel_path, full_path in zip(self.get_rel_paths(), self.get_full_paths()):
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if full_path.exists():
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raise forms.ValidationError(f"File already exists in {rel_path}")
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return self.cleaned_data["file_"]
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class HTMLarea(forms.Textarea):
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"""This is called from CaveForm in core/forms.py which is called from core/views/caves.py when editing a cave description
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(and similarly for Entrance Descriptions). It is alls called from core/views/expo.py when editing expo (i.e. handbook) pages.
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"""
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template_name = "widgets/HTMLarea.html"
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def __init__(self, *args, **kwargs):
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self.preview = kwargs.pop("preview", False)
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super(forms.Textarea, self).__init__(*args, **kwargs)
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def get_context(self, name, value, attrs):
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c = super(forms.Textarea, self).get_context(name, value, attrs)
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c["preview"] = self.preview
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return c
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