Serve file add-on for CircuitPython WSGI server

serve_file.py

import os
import time


class ServeFile:
    def __init__(self, app, path="", webpath=""):
        self._app = app
        self._path = path
        self._webpath = webpath
        # Common MIME types from https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
        self.mime_types = {
            "aac": "audio/aac",
            "abw": "application/x-abiword",
            "arc": "application/x-freearc",
            "avi": "video/x-msvideo",
            "azw": "application/vnd.amazon.ebook",
            "bin": "application/octet-stream",
            "bmp": "image/bmp",
            "bz": "application/x-bzip",
            "bz2": "application/x-bzip2",
            "csh": "application/x-csh",
            "css": "text/css",
            "csv": "text/csv",
            "doc": "application/msword",
            "docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            "eot": "application/vnd.ms-fontobject",
            "epub": "application/epub+zip",
            "gz": "application/gzip",
            "gif": "image/gif",
            "html": "text/html",
            "htm": "text/html",
            "ico": "image/vnd.microsoft.icon",
            "ics": "text/calendar",
            "jar": "application/java-archive",
            "jpeg .jpg": "image/jpeg",
            "js": "text/javascript",
            "json": "application/json",
            "jsonld": "application/ld+json",
            "mid": "audio/midi",
            "midi": "audio/midi",
            "mjs": "text/javascript",
            "mp3": "audio/mpeg",
            "cda": "application/x-cdf",
            "mp4": "video/mp4",
            "mpeg": "video/mpeg",
            "mpkg": "application/vnd.apple.installer+xml",
            "odp": "application/vnd.oasis.opendocument.presentation",
            "ods": "application/vnd.oasis.opendocument.spreadsheet",
            "odt": "application/vnd.oasis.opendocument.text",
            "oga": "audio/ogg",
            "ogv": "video/ogg",
            "ogx": "application/ogg",
            "opus": "audio/opus",
            "otf": "font/otf",
            "png": "image/png",
            "pdf": "application/pdf",
            "php": "application/x-httpd-php",
            "ppt": "application/vnd.ms-powerpoint",
            "pptx": "application/vnd.openxmlformats-officedocument.presentationml.presentation",
            "rar": "application/vnd.rar",
            "rtf": "application/rtf",
            "sh": "application/x-sh",
            "svg": "image/svg+xml",
            "swf": "application/x-shockwave-flash",
            "tar": "application/x-tar",
            "tiff": "image/tiff",
            "tif": "image/tiff",
            "ts": "video/mp2t",
            "ttf": "font/ttf",
            "txt": "text/plain",
            "vsd": "application/vnd.visio",
            "wav": "audio/wav",
            "weba": "audio/webm",
            "webm": "video/webm",
            "webp": "image/webp",
            "woff": "font/woff",
            "woff2": "font/woff2",
            "xhtml": "application/xhtml+xml",
            "xls": "application/vnd.ms-excel",
            "xlsx": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
            "xml": "application/xml",
            "xul": "application/vnd.mozilla.xul+xml",
            "zip": "application/zip",
            "7z": "application/x-7z-compressed"
        }

        app.on_request(["GET"], self._webpath + "/*.*",
                       lambda request: self.serve(request))

    # Serve a static file
    def serve(self, request):
        try:
            # Read in the file
            with open(self._path + request.path, "r") as file:
                (mode, ino, dev, nlink, uid, gid, size, atime,
                 mtime, ctime) = os.stat(self._path + request.path)
                year, month, day, hour, minute, second = time.localtime(mtime)[
                    :-3]
                return ("200 OK", [("Content-Type", self.set_mime_from_extention(request.path.split(".")[-1])), ("Last-Modified", "{}/{}/{} {}:{}:{}".format(day, month, year, hour, minute, second)), ("Content-Length", size), ("Cache-Control", "public, max-age=604800, immutable")], file.readlines())
        except:
            return ("404 not found", [], "Not Found")

    # Use a file extention to set the MIME content type
    def set_mime_from_extention(self, extention):
        if extention in self.mime_types:
            return self.mime_types[extention]
        else:
            return "text/plain"