Stable Diffusion image metadata viewer

Show Stable Diffusion generated image's metadata
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// ==UserScript==
// @name         Stable Diffusion image metadata viewer
// @namespace    https://github.com/himuro-majika
// @version      0.2.5
// @description  Show Stable Diffusion generated image's metadata
// @description:ja      Stable Diffusionで生成された画像の埋め込みメタデータを表示します
// @description:ko      표시 Stable Diffusion 생성된 이미지의 메타데이터
// @description:de      Metadaten des durch Stabile Diffusion erzeugten Bildes anzeigen
// @description:es      Mostrar los metadatos de la imagen generada por Stable Diffusion
// @description:fr      Afficher les métadonnées de l'image générée par la Stable Diffusion
// @description:it      Mostrare i metadati dell'immagine generata da Stable Diffusion
// @description:zh-CN   显示 Stable Diffusion 生成的图像的元数据
// @description:zh-SG   显示 Stable Diffusion 生成的图像的元数据
// @description:zh-TW   顯示 Stable Diffusion 生成圖像的元數據
// @description:zh-HK   顯示 Stable Diffusion 生成圖像的元數據
// @author       himuro_majika
// @match        http://*/*.png
// @match        http://*/*.jpg
// @match        http://*/*.jpeg
// @match        http://*/*.webp
// @match        https://*/*.png
// @match        https://*/*.jpg
// @match        https://*/*.jpeg
// @match        https://*/*.webp
// @match        file:///*.png
// @match        file:///*.jpg
// @match        file:///*.jpeg
// @match        file:///*.webp
// @require      https://cdn.jsdelivr.net/npm/[email protected]/dist/exif-reader.min.js
// @license      MIT
// @grant        GM_xmlhttpRequest
// @grant        GM_addElement
// ==/UserScript==

(function() {
    'use strict';

    const img = document.images[0];
    if (!img) return;
    readExif(img.src);

    function readExif(url) {
        fetch(url).then((response) => response.arrayBuffer())
        .then((fileBuffer) => loadTags(fileBuffer))
        .catch(() => {
            GM_xmlhttpRequest({
                method: "GET",
                url: url,
                responseType: "arraybuffer",
                onload: (res) => {
                    loadTags(res.response);
                },
                onerror: (e) => {
                    console.log(e);
                    return;
                }
            });
        });
    }

    function loadTags(fileBuffer) {
        if (!fileBuffer) return;
        try {
            const tags = ExifReader.load(fileBuffer, {expanded: true});
            const prompt = getPrompt(tags);
            makeData(prompt);
        } catch(e) {
            console.log(e);
        }
    }

    function getPrompt(tags) {
        // console.dir(JSON.parse(JSON.stringify(tags)));

        let com = ""
        let prompt = {
            positive: "",
            negative: "",
            others: ""
        }

        // Exif
        if (tags.exif && tags.exif.UserComment) {
            com = decodeUnicode(tags.exif.UserComment.value);
            try {
                prompt.positive = com.match(/([^]+)Negative prompt: /)[1];
                prompt.negative = com.match(/Negative prompt: ([^]+)Steps: /)[1];
                prompt.others = com.match(/(Steps: [^]+)/)[1];
            } catch (e) {
                console.log(com);
                prompt.others = com;
            }
            return prompt;
        }
        // iTXt
        if (!tags.pngText) return;
        // A1111
        if (tags.pngText.parameters) {
            com = tags.pngText.parameters.description;
            try {
                prompt.positive = com.match(/([^]+)Negative prompt: /)[1];
                prompt.negative = com.match(/Negative prompt: ([^]+)Steps: /)[1];
                prompt.others = com.match(/(Steps: [^]+)/)[1];
            } catch (e) {
                console.log(com);
                prompt.others = com;
            }
            return prompt;
        }
        // NMKD
        if (tags.pngText.Dream) {
            com = tags.pngText.Dream.description;
            com += tags.pngText["sd-metadata"] ? "\r\n" + tags.pngText["sd-metadata"].description : "";
            try {
                prompt.positive = com.match(/([^]+?)\[[^[]+\]/)[1];
                prompt.negative = com.match(/\[([^[]+?)(\]|Steps: )/)[1];
                prompt.others = com.match(/\]([^]+)/)[1];
            } catch (e) {
                console.log(com);
                prompt.others = com;
            }
            return prompt;
        }
        // NAI
        if (tags.pngText.Comment) {
            const comment = tags.pngText.Comment.description.replaceAll(/\\u00a0/g, " ");
            const positive = tags.pngText.Description ? tags.pngText.Description.description : JSON.parse(comment).prompt;
            const negative= JSON.parse(comment).uc;
            let others = comment + "\r\n";
            others += tags.pngText.Software ? tags.pngText.Software.description + "\r\n" : "";
            others += tags.pngText.Title ? tags.pngText.Title.description + "\r\n" : "";
            others += tags.pngText.Source ? tags.pngText.Source.description : "";
            others += tags.pngText["Generation time"] ? "\r\nGeneration time: " + tags.pngText["Generation time"].description : "";
            prompt.positive = positive;
            prompt.negative = negative;
            prompt.others = others;
            return prompt;
        }

        Object.keys(tags.pngText).forEach(tag => {
            com += tags.pngText[tag].description;
        });

        // console.log(com);
        prompt.others = com;
        return prompt;
    }

    function decodeUnicode(array) {
        const plain = array.map(t => t.toString(16).padStart(2, "0")).join("");
        if (!plain.match(/^554e49434f44450/)) {
            // console.log(array);
            return;
        }
        const hex = plain.replace(/^554e49434f44450[0-9]/, "").replace(/[0-9a-f]{4}/g, ",0x$&").replace(/^,/, "");
        const arhex = hex.split(",");
        let decode = "";
        arhex.forEach(v => {
            decode += String.fromCodePoint(v);
        })
        return decode;
    }

    function makeButton() {
        addStyle();
        const button = document.createElement("button");
        button.id = "_gm_simv_open_button";
        button.innerHTML = "Show SD metadata";
        button.addEventListener("click", showModal);
        document.body.insertBefore(button, img);
    }

    function makeData(prompt) {
        const positive = prompt.positive;
        const negative = prompt.negative;
        const others = prompt.others;
        if (!positive && !negative && !others) return;
        makeButton();
        const container = document.createElement("div");
        container.id ="_gm_simv_container";
        const copybutton = location.protocol == "http:" ? "" : `<button class="_gm_simv_copybutton" type="button">copy</button>`;
        container.innerHTML = `
<div class="_gm_simv_modal">
    <div class="_gm_simv_modal_title">
        <h5>Stable Diffusion image metadata</h5>
        <button id="_gm_simv_closebutton" type="button">❎</button>
    </div>
    <div class="_gm_simv_modal_body">
        <div>
            <div class="_gm_simv_section">
                <label>Prompt</label>
                ${copybutton}
            </div>
            <textarea rows="6">${positive}</textarea>
        </div>
        <div>
            <div class="_gm_simv_section">
                <label>Negative Prompt</label>
                ${copybutton}
            </div>
            <textarea rows="6">${negative}</textarea>
        </div>
        <div>
            <div class="_gm_simv_section">
                <label>Other info</label>
                ${copybutton}
            </div>
            <textarea rows="6">${others}</textarea>
        </div>
    </div>
</div>`;
        document.body.insertBefore(container, img);
        document.getElementById("_gm_simv_closebutton").addEventListener("click", closeModal);
        document.querySelectorAll("._gm_simv_copybutton").forEach(item => {
            item.addEventListener("click", copyText);
        });
    }

    function addStyle() {
        GM_addElement("style", { textContent: `
img {
    display: block; margin: auto;
}
#_gm_simv_open_button {
    position: absolute;
}
#_gm_simv_container {
    display: none; width: 100%;
}
._gm_simv_modal {
    color: #eee; width: 800px; max-width: 100%; margin-left: auto; margin-right: auto; z-index: 2; position: fixed; inset: auto 0; margin: auto; background: #000a; border-radius: 6px; box-shadow: #000 0px 0px 2px;
}
._gm_simv_modal_title {
    display:flex; justify-content: space-between; padding: 0px 10px;
}
._gm_simv_modal_body {
    padding: 10px;
}
#_gm_simv_closebutton {
    cursor: pointer; height: 4em; opacity: 0.5; padding: 1em; background: #0000; border: 0; width: 3em;
}
._gm_simv_section {
    display:flex; justify-content: space-between;
}
._gm_simv_modal textarea {
    display: block; width: 774px; max-width: 100%; background: #cccc; border: 0px none; margin: 10px 0;
}
._gm_simv_copybutton {
    cursor: pointer; opacity: 0.5;
}`});
    }

    function showModal() {
        document.getElementById("_gm_simv_container").style.display = "block";
    }

    function closeModal() {
        document.getElementById("_gm_simv_container").style.display = "none";
    }

    function copyText() {
        const value = this.parentNode.parentNode.querySelector("textarea").value;
        navigator.clipboard.writeText(value);
    }

})();