|
| 1 | +import time |
| 2 | +from abc import ABC, abstractmethod |
| 3 | + |
| 4 | +import requests |
| 5 | +from django.conf import settings |
| 6 | +from django.contrib.auth import get_user_model |
| 7 | +from django.core.files.uploadedfile import InMemoryUploadedFile, TemporaryUploadedFile |
| 8 | +from requests import Response |
| 9 | + |
| 10 | +from files.constants import SUPPORTED_IMAGES_TYPES |
| 11 | +from files.exceptions import SelectelUploadError |
| 12 | +from files.helpers import convert_image_to_webp |
| 13 | +from files.typings import FileInfo |
| 14 | +from procollab.settings import SELECTEL_SWIFT_URL |
| 15 | + |
| 16 | +User = get_user_model() |
| 17 | + |
| 18 | + |
| 19 | +class File: |
| 20 | + def __init__(self, file: TemporaryUploadedFile | InMemoryUploadedFile): |
| 21 | + self.size = file.size |
| 22 | + self.name = File._get_name(file) |
| 23 | + self.extension = File._get_extension(file) |
| 24 | + self.buffer = file.open(mode="rb") |
| 25 | + self.content_type = file.content_type |
| 26 | + |
| 27 | + # we can compress given type of image |
| 28 | + if self.content_type in SUPPORTED_IMAGES_TYPES: |
| 29 | + webp_image = convert_image_to_webp(file) |
| 30 | + self.buffer = webp_image.buffer() |
| 31 | + self.size = webp_image.size |
| 32 | + self.content_type = "image/webp" |
| 33 | + self.extension = "webp" |
| 34 | + |
| 35 | + @staticmethod |
| 36 | + def _get_name(file) -> str: |
| 37 | + name_parts = file.name.split(".") |
| 38 | + if len(name_parts) == 1: |
| 39 | + return name_parts[0] |
| 40 | + return ".".join(name_parts[:-1]) |
| 41 | + |
| 42 | + @staticmethod |
| 43 | + def _get_extension(file) -> str: |
| 44 | + if len(file.name.split(".")) > 1: |
| 45 | + return file.name.split(".")[-1] |
| 46 | + return "" |
| 47 | + |
| 48 | + |
| 49 | +class Storage(ABC): |
| 50 | + @abstractmethod |
| 51 | + def delete(self, url: str) -> Response: |
| 52 | + pass |
| 53 | + |
| 54 | + @abstractmethod |
| 55 | + def upload(self, file: File, user: User) -> FileInfo: |
| 56 | + pass |
| 57 | + |
| 58 | + |
| 59 | +class SelectelSwiftStorage(Storage): |
| 60 | + def delete(self, url: str) -> Response: |
| 61 | + token = self._get_auth_token() |
| 62 | + return requests.delete(url, headers={"X-Auth-Token": token}) |
| 63 | + |
| 64 | + def upload(self, file: File, user: User) -> FileInfo: |
| 65 | + url = self._upload(file, user) |
| 66 | + return FileInfo( |
| 67 | + url=url, |
| 68 | + name=file.name, |
| 69 | + extension=file.extension, |
| 70 | + mime_type=file.content_type, |
| 71 | + size=file.size, |
| 72 | + ) |
| 73 | + |
| 74 | + def _upload(self, file: File, user: User) -> str: |
| 75 | + token = self._get_auth_token() |
| 76 | + url = self._generate_url(file, user) |
| 77 | + |
| 78 | + requests.put( |
| 79 | + url, |
| 80 | + headers={ |
| 81 | + "X-Auth-Token": token, |
| 82 | + "Content-Type": file.content_type, |
| 83 | + }, |
| 84 | + data=file.buffer, |
| 85 | + ) |
| 86 | + |
| 87 | + return url |
| 88 | + |
| 89 | + def _generate_url(self, file: File, user: User) -> str: |
| 90 | + """ |
| 91 | + Generates url for selcdn |
| 92 | + Returns: |
| 93 | + url: str looks like /hashedEmail/hashedFilename_hashedTime.extension |
| 94 | + """ |
| 95 | + return ( |
| 96 | + f"{SELECTEL_SWIFT_URL}" |
| 97 | + f"{abs(hash(user.email))}" |
| 98 | + f"/{abs(hash(file.name))}" |
| 99 | + f"_{abs(hash(time.time()))}" |
| 100 | + f".{file.extension}" |
| 101 | + ) |
| 102 | + |
| 103 | + @staticmethod |
| 104 | + def _get_auth_token(): |
| 105 | + """ |
| 106 | + Returns auth token |
| 107 | + """ |
| 108 | + |
| 109 | + data = { |
| 110 | + "auth": { |
| 111 | + "identity": { |
| 112 | + "methods": ["password"], |
| 113 | + "password": { |
| 114 | + "user": { |
| 115 | + "id": settings.SELECTEL_CONTAINER_USERNAME, |
| 116 | + "password": settings.SELECTEL_CONTAINER_PASSWORD, |
| 117 | + } |
| 118 | + }, |
| 119 | + } |
| 120 | + } |
| 121 | + } |
| 122 | + response = requests.post(settings.SELECTEL_AUTH_TOKEN_URL, json=data) |
| 123 | + if response.status_code not in [200, 201]: |
| 124 | + raise SelectelUploadError( |
| 125 | + "Couldn't generate a token for Selectel Swift API (selcdn)" |
| 126 | + ) |
| 127 | + return response.headers["x-subject-token"] |
| 128 | + |
| 129 | + |
| 130 | +class CDN: |
| 131 | + def __init__(self, storage: Storage) -> None: |
| 132 | + self.storage = storage |
| 133 | + |
| 134 | + def delete(self, url: str) -> Response: |
| 135 | + return self.storage.delete(url) |
| 136 | + |
| 137 | + def upload( |
| 138 | + self, file: TemporaryUploadedFile | InMemoryUploadedFile, user: User |
| 139 | + ) -> FileInfo: |
| 140 | + return self.storage.upload(File(file), user) |
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