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[descriptors][templating] experimental handlebar support
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121
bundlebee-core/src/main/java/io/yupiik/bundlebee/core/handlebars/HandlebarsInterpolator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| /* | ||
| * Copyright (c) 2021 - present - Yupiik SAS - https://www.yupiik.com | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
| package io.yupiik.bundlebee.core.handlebars; | ||
|
|
||
| import io.yupiik.bundlebee.core.descriptor.Manifest; | ||
| import io.yupiik.bundlebee.core.service.AlveolusHandler; | ||
| import io.yupiik.fusion.framework.handlebars.HandlebarsCompiler; | ||
| import io.yupiik.fusion.framework.handlebars.compiler.accessor.MapAccessor; | ||
|
|
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| import java.util.Base64; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.function.BiFunction; | ||
| import java.util.function.Function; | ||
|
|
||
| import static java.nio.charset.StandardCharsets.UTF_8; | ||
| import static java.util.stream.Collectors.toMap; | ||
|
|
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| public class HandlebarsInterpolator { | ||
| private final Manifest.Alveolus alveolus; | ||
| private final AlveolusHandler.LoadedDescriptor descriptor; | ||
| private final String id; | ||
| private final Map<String, Function<Object, String>> helpers; | ||
| private final BiFunction<String, String, String> defaultLookup; | ||
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|
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| public HandlebarsInterpolator(final Manifest.Alveolus alveolus, | ||
| final AlveolusHandler.LoadedDescriptor descriptor, | ||
| final String id, | ||
| final Map<String, Function<Object, String>> customHelpers, | ||
| final BiFunction<String, String, String> defaultLookup) { | ||
| this.alveolus = alveolus; | ||
| this.descriptor = descriptor; | ||
| this.id = id; | ||
| this.helpers = customHelpers; | ||
| this.defaultLookup = defaultLookup; | ||
| } | ||
|
|
||
| public String apply(final String template) { | ||
| final Map<String, Function<Object, String>> specificHelpers = helpers.entrySet().stream() | ||
| .collect(toMap( | ||
| Map.Entry::getKey, | ||
| // inject the id as last param | ||
| p -> o -> p.getValue().apply(new Object[]{o, id}))); | ||
| specificHelpers.put("base64", a -> Base64.getEncoder().encodeToString(a.toString().getBytes(UTF_8))); | ||
| specificHelpers.put("base64url", a -> Base64.getUrlEncoder().withoutPadding().encodeToString(a.toString().getBytes(UTF_8))); | ||
|
|
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| final var rootData = Map.of( | ||
| "alveolus", alveolus, | ||
| "descriptor", descriptor, | ||
| "executionId", id == null ? "" : id); | ||
| return new HandlebarsCompiler( | ||
| new MapAccessor() { | ||
| @Override | ||
| public Object find(final Object data, final String name) { | ||
| if (data instanceof String) { // standard placeholder? | ||
| return doDefaultLookup(data + "." + name); | ||
| } | ||
|
|
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| final var found = super.find(data, name); | ||
| if (found == null) { | ||
| return doDefaultLookup(name); | ||
| } | ||
|
|
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| if (found instanceof Manifest.Alveolus) { | ||
| return asMap((Manifest.Alveolus) found); | ||
| } | ||
| if (found instanceof AlveolusHandler.LoadedDescriptor) { | ||
| return asMap((AlveolusHandler.LoadedDescriptor) found); | ||
| } | ||
| return found; | ||
| } | ||
| }) | ||
| .compile(new HandlebarsCompiler.CompilationContext(new HandlebarsCompiler.Settings().helpers(specificHelpers), template)) | ||
| .render(rootData); | ||
| } | ||
|
|
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| private String doDefaultLookup(final String name) { | ||
| final var value = defaultLookup.apply("{{" + name + "}}", id); | ||
| if (value == null || "null".equals(value)) { | ||
| return name; | ||
| } | ||
| return value; | ||
| } | ||
|
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| private Map<Object, Object> asMap(final Manifest.Alveolus alveolus) { | ||
| final var map = new HashMap<>(); | ||
| map.put("name", alveolus.getName()); | ||
| if (alveolus.getVersion() != null) { | ||
| map.put("version", alveolus.getVersion()); | ||
| } | ||
| if (alveolus.getPlaceholders() != null) { | ||
| map.putAll(alveolus.getPlaceholders()); | ||
| } | ||
| return map; | ||
| } | ||
|
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| private Map<Object, Object> asMap(final AlveolusHandler.LoadedDescriptor descriptor) { | ||
| final var map = new HashMap<>(); | ||
| map.put("name", descriptor.getConfiguration().getName()); | ||
| if (descriptor.getConfiguration().getLocation() != null) { | ||
| map.put("location", descriptor.getConfiguration().getLocation()); | ||
| } | ||
| if (descriptor.getConfiguration().getType() != null) { | ||
| map.put("type", descriptor.getConfiguration().getType()); | ||
| } | ||
| return map; | ||
| } | ||
| } |
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