Allow inputs to accept stringified JSON

README.md

@@ -67,6 +67,14 @@ steps:
       !path/**/*.tmp
 ```
 
+### Upload multiple artifacts using a JSON string
+```yaml
+- uses: actions/upload-artifact@v2
+  with:
+    name: '["my-artifact", "my-artifact-2"]'
+    path: '["path/to/artifact/1/", "path/to/artifact/2/"]'
+```
+
 For supported wildcards along with behavior and documentation, see [@actions/glob](https://github.com/actions/toolkit/tree/main/packages/glob) which is used internally to search for files.
 
 If a wildcard pattern is used, the path hierarchy will be preserved after the first wildcard pattern. 

action.yml

@@ -3,8 +3,7 @@ description: 'Upload a build artifact that can be used by subsequent workflow st
 author: 'GitHub'
 inputs: 
   name:
-    description: 'Artifact name'
+    description: 'Artifact name, default is "artifact"'
-    default: 'artifact'
   path:
     description: 'A file, directory or wildcard pattern that describes what to upload'
     required: true

dist/index.js

@@ -6581,12 +6581,16 @@ const constants_1 = __webpack_require__(694);
 function getInputs() {
     const name = core.getInput(constants_1.Inputs.Name);
     const path = core.getInput(constants_1.Inputs.Path, { required: true });
-    const searchPath = Array.isArray(path) ? path : [path];
+    const searchPath = parseFromJSON(path) || [path];
     const defaultArtifactName = 'artifact';
     // Accepts an individual value or an array as input, if array sizes don't match, use default value instead
-    const artifactName = Array.isArray(name)
+    const artifactName = parseParamaterToArrayFromInput(name, searchPath.length, defaultArtifactName, (defaultInput, index) => {
-        ? name.concat(new Array(Math.max(0, searchPath.length - name.length)).fill(defaultArtifactName))
+        const artifactIndexStr = index == 0 ? '' : `_${index + 1}`;
-        : new Array(searchPath.length).fill(name || defaultArtifactName);
+        return `${defaultInput}${artifactIndexStr}`;
+    });
+    // Accepts an individual value or an array as input
+    const retention = core.getInput(constants_1.Inputs.RetentionDays);
+    const retentionDays = parseParamaterToArrayFromInput(retention, searchPath.length, undefined, defaultInput => defaultInput).map(parseRetentionDays);
     const ifNoFilesFound = core.getInput(constants_1.Inputs.IfNoFilesFound);
     const noFileBehavior = constants_1.NoFileOptions[ifNoFilesFound];
     if (!noFileBehavior) {
@@ -6595,35 +6599,44 @@ function getInputs() {
     const inputs = {
         artifactName,
         searchPath,
+        retentionDays,
         ifNoFilesFound: noFileBehavior
     };
-    // Accepts an individual value or an array as input
-    const retentionDays = core.getInput(constants_1.Inputs.RetentionDays);
-    if (Array.isArray(retentionDays)) {
-        // If array sizes don't match, use default value instead
-        inputs.retentionDays = retentionDays
-            .map(parseRetentionDays)
-            .concat(new Array(Math.max(0, searchPath.length - retentionDays.length)).fill(undefined));
-    }
-    else {
-        const retention = parseRetentionDays(retentionDays);
-        inputs.retentionDays = new Array(searchPath.length).fill(retention);
-    }
     return inputs;
 }
 exports.getInputs = getInputs;
+function parseParamaterToArrayFromInput(input, requiredLength, defaultInput, defaultFunc) {
+    // Accepts an individual value or an array as input, if array size doesn't match the required length, fill the rest with a default value
+    const inputArray = parseFromJSON(input || '[]');
+    if (inputArray != null) {
+        // If a stringified JSON array is provided, use it and concat it with the default when required
+        return inputArray.concat(Array.from({ length: Math.max(0, requiredLength - inputArray.length) }, (_, index) => defaultFunc(defaultInput, index)));
+    }
+    // If a string is provided, fill the array with that value
+    return Array.from({ length: Math.max(0, requiredLength) }, (_, index) => defaultFunc(input || defaultInput, index));
+}
+function parseFromJSON(jsonStr) {
+    try {
+        const json = JSON.parse(jsonStr);
+        if (Array.isArray(json)) {
+            return json;
+        }
+    }
+    catch (_err) {
+        // Input wasn't a stringified JSON array (string[]), return undefined to signal an invalid JSON was provided
+    }
+    return undefined;
+}
 function parseRetentionDays(retentionDaysStr) {
-    if (retentionDaysStr) {
+    if (retentionDaysStr != null) {
         const retentionDays = parseInt(retentionDaysStr);
         if (isNaN(retentionDays)) {
             core.setFailed('Invalid retention-days');
         }
         return retentionDays;
     }
-    else {
     return undefined;
 }
-}
 
 
 /***/ }),

src/input-helper.ts

@@ -9,17 +9,28 @@ export function getInputs(): UploadInputs {
   const name = core.getInput(Inputs.Name)
   const path = core.getInput(Inputs.Path, {required: true})
 
-  const searchPath = Array.isArray(path) ? path : [path]
+  const searchPath = parseFromJSON(path) || [path]
 
   const defaultArtifactName = 'artifact'
   // Accepts an individual value or an array as input, if array sizes don't match, use default value instead
-  const artifactName = Array.isArray(name)
+  const artifactName = parseParamaterToArrayFromInput(
-    ? name.concat(
+    name,
-        new Array(Math.max(0, searchPath.length - name.length)).fill(
+    searchPath.length,
-          defaultArtifactName
+    defaultArtifactName,
+    (defaultInput, index) => {
+      const artifactIndexStr = index == 0 ? '' : `_${index + 1}`
+      return `${defaultInput}${artifactIndexStr}`
+    }
   )
-      )
+
-    : new Array(searchPath.length).fill(name || defaultArtifactName)
+  // Accepts an individual value or an array as input
+  const retention = core.getInput(Inputs.RetentionDays)
+  const retentionDays = parseParamaterToArrayFromInput(
+    retention,
+    searchPath.length,
+    undefined,
+    defaultInput => defaultInput
+  ).map(parseRetentionDays)
 
   const ifNoFilesFound = core.getInput(Inputs.IfNoFilesFound)
   const noFileBehavior: NoFileOptions = NoFileOptions[ifNoFilesFound]
@@ -37,38 +48,60 @@ export function getInputs(): UploadInputs {
   const inputs = {
     artifactName,
     searchPath,
+    retentionDays,
     ifNoFilesFound: noFileBehavior
   } as UploadInputs
 
-  // Accepts an individual value or an array as input
+  return inputs
-  const retentionDays = core.getInput(Inputs.RetentionDays)
-  if (Array.isArray(retentionDays)) {
-    // If array sizes don't match, use default value instead
-    inputs.retentionDays = retentionDays
-      .map(parseRetentionDays)
-      .concat(
-        new Array(Math.max(0, searchPath.length - retentionDays.length)).fill(
-          undefined
-        )
-      )
-  } else {
-    const retention = parseRetentionDays(retentionDays)
-    inputs.retentionDays = new Array(searchPath.length).fill(retention)
 }
 
-  return inputs
+function parseParamaterToArrayFromInput(
+  input: string | undefined,
+  requiredLength: number,
+  defaultInput: string | undefined,
+  defaultFunc: (
+    defaultInput: string | undefined,
+    index: number
+  ) => string | undefined
+): (string | undefined)[] {
+  // Accepts an individual value or an array as input, if array size doesn't match the required length, fill the rest with a default value
+  const inputArray = parseFromJSON(input || '[]')
+  if (inputArray != null) {
+    // If a stringified JSON array is provided, use it and concat it with the default when required
+    return (<(string | undefined)[]>inputArray).concat(
+      Array.from(
+        {length: Math.max(0, requiredLength - inputArray.length)},
+        (_, index) => defaultFunc(defaultInput, index)
+      )
+    )
+  }
+  // If a string is provided, fill the array with that value
+  return Array.from({length: Math.max(0, requiredLength)}, (_, index) =>
+    defaultFunc(input || defaultInput, index)
+  )
+}
+
+function parseFromJSON(jsonStr: string): string[] | undefined {
+  try {
+    const json = <string[]>JSON.parse(jsonStr)
+    if (Array.isArray(json)) {
+      return json
+    }
+  } catch (_err) {
+    // Input wasn't a stringified JSON array (string[]), return undefined to signal an invalid JSON was provided
+  }
+  return undefined
 }
 
 function parseRetentionDays(
   retentionDaysStr: string | undefined
 ): number | undefined {
-  if (retentionDaysStr) {
+  if (retentionDaysStr != null) {
     const retentionDays = parseInt(retentionDaysStr)
     if (isNaN(retentionDays)) {
       core.setFailed('Invalid retention-days')
     }
     return retentionDays
-  } else {
+  }
   return undefined
 }
-}