Moving on with implementation of the lib

src/bin/build-keycloak-theme/generateFtl/ftl2js.ftl

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+<script>const _= 
+{
+    "url": {
+        "loginAction": "${url.loginAction}",
+        "resourcesPath": "${url.resourcesPath}",
+        "resourcesCommonPath": "${url.resourcesCommonPath}",
+        "loginRestartFlowUrl": "${url.loginRestartFlowUrl}"
+    },
+    "realm": {
+        "displayName": "${realm.displayName!''}" || undefined,
+        "displayNameHtml": "${realm.displayNameHtml!''}" || undefined,
+        "internationalizationEnabled": ${realm.internationalizationEnabled?c}
+    },
+    "locale": (function (){
+
+        <#if realm.internationalizationEnabled>
+
+            return {
+                "supported": (function(){
+
+                    <#if realm.internationalizationEnabled>
+
+                        var out= [];
+
+                        <#list locale.supported as lng>
+                            out.push({ 
+                                "url": "${lng.url}", 
+                                "label": "${lng.label}",
+                                "languageTag": "${lng.languageTag}"
+                            });
+                        </#list>
+
+                        return out;
+
+                    </#if>
+
+                    return undefined;
+
+                })(),
+                "current": "${locale.current}"
+            };
+
+        </#if>
+
+        return undefined;
+
+    })(),
+    "auth": (function (){
+
+
+        <#if auth?has_content>
+
+            var out= {
+                "showUsername": ${auth.showUsername()?c},
+                "showResetCredentials": ${auth.showResetCredentials()?c},
+                "showTryAnotherWayLink": ${auth.showTryAnotherWayLink()?c}
+            };
+
+            <#if auth.showUsername() && !auth.showResetCredentials()>
+                Object.assign(
+                    out,
+                    {
+                        "attemptedUsername": "${auth.attemptedUsername}"
+                    }
+                );
+            </#if>
+
+            return out;
+
+        </#if>
+
+
+        return undefined;
+
+    })(),
+    "scripts": (function(){
+
+        var out = [];
+
+        <#if scripts??>
+            <#list scripts as script>
+        out.push("${script}");
+            </#list>
+        </#if>
+
+        return out;
+
+    })(),
+    "message": (function (){
+
+        <#if message?has_content>
+
+            return { 
+                "type": "${message.type}",
+                "summary": "${kcSanitize(message.summary)?no_esc}"
+            };
+
+        </#if>
+
+        return undefined;
+
+    })(),
+    "isAppInitiatedAction": (function (){
+
+        <#if isAppInitiatedAction??>
+            return true;
+        </#if>
+        return false;
+
+    })()
+
+}
+</script>

src/bin/build-keycloak-theme/generateFtl/index.ts

@@ -0,0 +1,127 @@
+
+
+import cheerio from "cheerio";
+import {
+    replaceImportFromStaticInJsCode,
+    generateCssCodeToDefineGlobals
+} from "../replaceImportFromStatic";
+import fs from "fs";
+import { join as pathJoin } from "path";
+import { objectKeys } from "evt/tools/typeSafety/objectKeys";
+
+export function generateFtlFilesCodeFactory(
+    params: {
+        ftlValuesGlobalName: string;
+        cssGlobalsToDefine: Record<string, string>;
+        indexHtmlCode: string;
+    }
+) {
+
+    const { ftlValuesGlobalName, cssGlobalsToDefine, indexHtmlCode } = params;
+
+    const $ = cheerio.load(indexHtmlCode);
+
+    $("script:not([src])").each((...[, element]) => {
+
+        const { fixedJsCode } = replaceImportFromStaticInJsCode({
+            ftlValuesGlobalName,
+            "jsCode": $(element).html()!
+        });
+
+        $(element).text(fixedJsCode);
+
+    });
+
+
+    ([
+        ["link", "href"],
+        ["script", "src"],
+    ] as const).forEach(([selector, attrName]) =>
+        $(selector).each((...[, element]) => {
+
+            const href = $(element).attr(attrName);
+
+            if (!href?.startsWith("/")) {
+                return;
+            }
+
+            $(element).attr(attrName, "${url.resourcesPath}" + href);
+
+        })
+    );
+
+    //FTL is no valid html, we can't insert with cheerio, we put placeholder for injecting later.
+    const ftlPlaceholders = {
+        '{ "x": "xIdLqMeOed9sdLdIdOxdK0d" }':
+            fs.readFileSync(pathJoin(__dirname, "ftl2js.ftl"))
+                .toString("utf8")
+                .match(/^<script>const _=((?:.|\n)+)<\/script>[\n]?$/)![1],
+        '<!-- xIdLqMeOedErIdLsPdNdI9dSlxI -->':
+            [
+                '<#if scripts??>',
+                '    <#list scripts as script>',
+                '        <script src="${script}" type="text/javascript"></script>',
+                '    </#list>',
+                '</#if>',
+            ].join("\n")
+    };
+
+    $("head").prepend(
+        [
+            ...(Object.keys(cssGlobalsToDefine).length === 0 ? [] : [
+                '',
+                '<style>',
+                generateCssCodeToDefineGlobals(
+                    { cssGlobalsToDefine }
+                ).cssCodeToPrependInHead,
+                '</style>',
+                ''
+            ]),
+            '<script>',
+            '    Object.assign(',
+            `        window.${ftlValuesGlobalName},`,
+            `        ${objectKeys(ftlPlaceholders)[0]}`,
+            '    );',
+            '</script>',
+            '',
+            objectKeys(ftlPlaceholders)[1],
+            ''
+        ].join("\n"),
+    );
+
+
+    const partiallyFixedIndexHtmlCode = $.html();
+
+    function generateFtlFilesCode(
+        params: {
+            pageBasename: "login.ftl" | "register.ftl"
+        }
+    ): { ftlCode: string; } {
+
+        const { pageBasename } = params;
+
+        const $ = cheerio.load(partiallyFixedIndexHtmlCode);
+
+        $("head").prepend(
+            [
+                '',
+                '<script>',
+                `   window.${ftlValuesGlobalName} = { "pageBasename": "${pageBasename}" };`,
+                '</script>',
+                ''
+            ].join("\n")
+        );
+
+        let ftlCode = $.html();
+
+        objectKeys(ftlPlaceholders)
+            .forEach(id => ftlCode = ftlCode.replace(id, ftlPlaceholders[id]));
+
+        return { ftlCode };
+
+    }
+
+    return { generateFtlFilesCode };
+
+
+}