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Stef-00012 2025-01-27 00:37:37 +01:00
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79
functions/util.ts
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@ -1,14 +1,9 @@
import mimetypesJSON from "@/assets/mimetypes.json";
import type { Mimetypes } from "@/types/mimetypes";
import axios from "axios";
import * as FileSystem from "expo-file-system";
const mimetypes = mimetypesJSON as Mimetypes;
export function generateRandomString(): string {
return Math.random().toString(36).substring(2, 6);
}
export function guessMimetype(
mimetype: keyof Mimetypes,
): Mimetypes[keyof Mimetypes] {
@ -25,62 +20,14 @@ export function guessExtension(
): keyof Mimetypes {
if (!mimetype) return "application/octet-stream";
const mime = Object.entries(mimetypes).find(([key, value]) => value === mimetype) as [keyof Mimetypes, Mimetypes[keyof Mimetypes]] | undefined;
const mime = Object.entries(mimetypes).find(
([key, value]) => value === mimetype,
) as [keyof Mimetypes, Mimetypes[keyof Mimetypes]] | undefined;
if (!mime) return "application/octet-stream";
return mime[0];
}
// export function convertToBlob(data: string): Blob {
// console.debug("ctb", 1)
// const base64Data = data.split(",")[1];
// // console.debug("ctb", 2, base64Data)
// const mimetype = data.split(":")[1].split(";").shift();
// console.debug("ctb", 3, mimetype)
// const string = atob(base64Data);
// const length = string.length;
// console.debug("ctb", 4, length)
// const bytes = new Uint8Array(length);
// for (let i = 0; i < length; i++) {
// console.debug("ctb", 4.5, i, length)
// bytes[i] = string.charCodeAt(i);
// }
// const blob = new Blob([bytes], { type: mimetype || "image/png" });
// console.debug("ctb", 5, blob)
// return blob;
// }
// export function convertToBlob(utf8Data: string, mimetype?: string): Blob {
// console.debug("ctb", 1)
// const byteCharacters = new TextEncoder().encode(utf8Data);
// console.debug(byteCharacters, byteCharacters.length)
// console.debug("ctb", 2)
// const blob = new Blob([byteCharacters], { type: mimetype });
// console.debug("ctb", 3)
// console.debug(blob)
// return blob;
// }
export async function convertToBlob(fileURI: string): Promise<Blob | null> {
try {
const res = await axios.get(fileURI, {
responseType: "blob"
})
return res.data;
} catch(e) {
return null;
}
}
export async function getFileDataURI(filePath: string): Promise<string | null> {
const base64Data = await FileSystem.readAsStringAsync(filePath, {
encoding: FileSystem.EncodingType.Base64,
@ -88,7 +35,7 @@ export async function getFileDataURI(filePath: string): Promise<string | null> {
const extension = filePath.split(".").pop();
const mimetype = guessExtension(extension as Mimetypes[keyof Mimetypes])
const mimetype = guessExtension(extension as Mimetypes[keyof Mimetypes]);
const dataURI = `data:${mimetype};base64,${base64Data}`;
@ -134,4 +81,20 @@ export function timeDifference(currentDate: Date, targetDate: Date) {
const difference = Math.round(absElapsed / msPerYear);
return `${isFuture ? "in " : ""}${difference} year${difference !== 1 ? "s" : ""}${isFuture ? "" : " ago"}`;
}
}
export function colorHash(str: string) {
let hash = 0;
for (let i = 0; i < str.length; i++) {
hash = str.charCodeAt(i) + ((hash << 5) - hash);
}
let color = "#";
for (let i = 0; i < 3; i++) {
const value = (hash >> (i * 8)) & 0xff;
color += `00${value.toString(16)}`.substr(-2);
}
return color;
}