feat: support externalValue for examples

implements #551, related to #840

src/common-elements/samples.tsx

@@ -1,4 +1,5 @@
 import styled from '../styled-components';
+import { PrismDiv } from './PrismDiv';
 
 export const SampleControls = styled.div`
   opacity: 0.4;
@@ -21,3 +22,12 @@ export const SampleControlsWrap = styled.div`
     opacity: 1;
   }
 `;
+
+export const StyledPre = styled(PrismDiv.withComponent('pre'))`
+  font-family: ${props => props.theme.typography.code.fontFamily};
+  font-size: ${props => props.theme.typography.code.fontSize};
+  overflow-x: auto;
+  margin: 0;
+
+  white-space: ${({ theme }) => (theme.typography.code.wrap ? 'pre-wrap' : 'pre')};
+`;

src/components/PayloadSamples/Example.tsx

@@ -0,0 +1,52 @@
+import * as React from 'react';
+
+import { StyledPre } from '../../common-elements/samples';
+import { ExampleModel } from '../../services/models';
+import { isJsonLike, langFromMime } from '../../utils';
+import { JsonViewer } from '../JsonViewer/JsonViewer';
+import { SourceCodeWithCopy } from '../SourceCode/SourceCode';
+import { ExampleValue } from './ExampleValue';
+import { useExternalExample } from './exernalExampleHook';
+
+export interface ExampleProps {
+  example: ExampleModel;
+  mimeType: string;
+}
+
+export function Example({ example, mimeType }: ExampleProps) {
+  if (example.value === undefined && example.externalValueUrl) {
+    return <ExternalExample example={example} mimeType={mimeType} />;
+  } else {
+    return <ExampleValue value={example.value} mimeType={mimeType} />;
+  }
+}
+
+export function ExternalExample({ example, mimeType }: ExampleProps) {
+  let value = useExternalExample(example, mimeType);
+
+  if (value === undefined) {
+    return <span>Loading...</span>;
+  }
+
+  if (value instanceof Error) {
+    console.log(value);
+    return (
+      <StyledPre>
+        Error loading external example: <br />
+        <a className={'token string'} href={example.externalValueUrl} target="_blank">
+          {example.externalValueUrl}
+        </a>
+      </StyledPre>
+    );
+  }
+
+  if (isJsonLike(mimeType)) {
+    return <JsonViewer data={value} />;
+  } else {
+    if (typeof value === 'object') {
+      // just in case example was cached as json but used as non-json
+      value = JSON.stringify(value, null, 2);
+    }
+    return <SourceCodeWithCopy lang={langFromMime(mimeType)} source={value} />;
+  }
+}

src/components/PayloadSamples/ExampleValue.tsx

@@ -0,0 +1,18 @@
+import * as React from 'react';
+
+import { isJsonLike, langFromMime } from '../../utils/openapi';
+import { JsonViewer } from '../JsonViewer/JsonViewer';
+import { SourceCodeWithCopy } from '../SourceCode/SourceCode';
+
+export interface ExampleValueProps {
+  value: any;
+  mimeType: string;
+}
+
+export function ExampleValue({ value, mimeType }: ExampleValueProps) {
+  if (isJsonLike(mimeType)) {
+    return <JsonViewer data={value} />;
+  } else {
+    return <SourceCodeWithCopy lang={langFromMime(mimeType)} source={value} />;
+  }
+}

src/components/PayloadSamples/MediaTypeSamples.tsx

@@ -2,11 +2,9 @@ import * as React from 'react';
 
 import { SmallTabs, Tab, TabList, TabPanel } from '../../common-elements';
 import { MediaTypeModel } from '../../services/models';
-import { JsonViewer } from '../JsonViewer/JsonViewer';
-import { SourceCodeWithCopy } from '../SourceCode/SourceCode';
-import { NoSampleLabel } from './styled.elements';
 
-import { isJsonLike, langFromMime } from '../../utils';
+import { Example } from './Example';
+import { NoSampleLabel } from './styled.elements';
 
 export interface PayloadSamplesProps {
   mediaType: MediaTypeModel;
@@ -18,13 +16,6 @@ export class MediaTypeSamples extends React.Component<PayloadSamplesProps> {
     const mimeType = this.props.mediaType.name;
 
     const noSample = <NoSampleLabel>No sample</NoSampleLabel>;
-    const sampleView = isJsonLike(mimeType)
-      ? sample => <JsonViewer data={sample} />
-      : sample =>
-          (sample !== undefined && (
-            <SourceCodeWithCopy lang={langFromMime(mimeType)} source={sample} />
-          )) ||
-          noSample;
 
     const examplesNames = Object.keys(examples);
     if (examplesNames.length === 0) {
@@ -39,13 +30,19 @@ export class MediaTypeSamples extends React.Component<PayloadSamplesProps> {
             ))}
           </TabList>
           {examplesNames.map(name => (
-            <TabPanel key={name}>{sampleView(examples[name].value)}</TabPanel>
+            <TabPanel key={name}>
+              <Example example={examples[name]} mimeType={mimeType} />
+            </TabPanel>
           ))}
         </SmallTabs>
       );
     } else {
       const name = examplesNames[0];
-      return <div>{sampleView(examples[name].value)}</div>;
+      return (
+        <div>
+          <Example example={examples[name]} mimeType={mimeType} />
+        </div>
+      );
     }
   }
 }

src/components/PayloadSamples/exernalExampleHook.ts

@@ -0,0 +1,34 @@
+import { useEffect, useRef, useState } from 'react';
+import { ExampleModel } from '../../services/models/Example';
+
+export function useExternalExample(example: ExampleModel, mimeType: string) {
+  const [, setIsLoading] = useState(true); // to trigger component reload
+
+  const value = useRef<any>(undefined);
+  const prevRef = useRef<ExampleModel | undefined>(undefined);
+
+  if (prevRef.current !== example) {
+    value.current = undefined;
+  }
+
+  prevRef.current = example;
+
+  useEffect(
+    () => {
+      const load = async () => {
+        setIsLoading(true);
+        try {
+          value.current = await example.getExternalValue(mimeType);
+        } catch (e) {
+          value.current = e;
+        }
+        setIsLoading(false);
+      };
+
+      load();
+    },
+    [example, mimeType],
+  );
+
+  return value.current;
+}

src/components/SourceCode/SourceCode.tsx

@@ -1,19 +1,8 @@
 import * as React from 'react';
 import { highlight } from '../../utils';
 
-import { SampleControls, SampleControlsWrap } from '../../common-elements';
+import { SampleControls, SampleControlsWrap, StyledPre } from '../../common-elements';
 import { CopyButtonWrapper } from '../../common-elements/CopyButtonWrapper';
-import { PrismDiv } from '../../common-elements/PrismDiv';
-import styled from '../../styled-components';
-
-const StyledPre = styled(PrismDiv.withComponent('pre'))`
-  font-family: ${props => props.theme.typography.code.fontFamily};
-  font-size: ${props => props.theme.typography.code.fontSize};
-  overflow-x: auto;
-  margin: 0;
-
-  white-space: ${({ theme }) => (theme.typography.code.wrap ? 'pre-wrap' : 'pre')};
-`;
 
 export interface SourceCodeProps {
   source: string;

src/services/models/Example.ts

@@ -1,14 +1,55 @@
+import { resolve as urlResolve } from 'url';
+
 import { OpenAPIExample, Referenced } from '../../types';
+import { isJsonLike } from '../../utils/openapi';
 import { OpenAPIParser } from '../OpenAPIParser';
 
+const externalExamplesCache: { [url: string]: Promise<any> } = {};
+
 export class ExampleModel {
   value: any;
   summary?: string;
   description?: string;
-  externalValue?: string;
+  externalValueUrl?: string;
 
   constructor(parser: OpenAPIParser, infoOrRef: Referenced<OpenAPIExample>) {
-    Object.assign(this, parser.deref(infoOrRef));
+    const example = parser.deref(infoOrRef);
+    this.value = example.value;
+    this.summary = example.summary;
+    this.description = example.description;
+    if (example.externalValue) {
+      this.externalValueUrl = urlResolve(parser.specUrl || '', example.externalValue);
+    }
     parser.exitRef(infoOrRef);
   }
+
+  getExternalValue(mimeType: string): Promise<any> {
+    if (!this.externalValueUrl) {
+      return Promise.resolve(undefined);
+    }
+
+    if (externalExamplesCache[this.externalValueUrl]) {
+      return externalExamplesCache[this.externalValueUrl];
+    }
+
+    externalExamplesCache[this.externalValueUrl] = fetch(this.externalValueUrl).then(res => {
+      return res.text().then(txt => {
+        if (!res.ok) {
+          return Promise.reject(new Error(txt));
+        }
+
+        if (isJsonLike(mimeType)) {
+          try {
+            return JSON.parse(txt);
+          } catch (e) {
+            return txt;
+          }
+        } else {
+          return txt;
+        }
+      });
+    });
+
+    return externalExamplesCache[this.externalValueUrl];
+  }
 }

src/services/models/MediaType.ts

@@ -1,6 +1,6 @@
 import * as Sampler from 'openapi-sampler';
 
-import { OpenAPIExample, OpenAPIMediaType } from '../../types';
+import { OpenAPIMediaType } from '../../types';
 import { RedocNormalizedOptions } from '../RedocNormalizedOptions';
 import { SchemaModel } from './Schema';
 
@@ -9,7 +9,7 @@ import { OpenAPIParser } from '../OpenAPIParser';
 import { ExampleModel } from './Example';
 
 export class MediaTypeModel {
-  examples?: { [name: string]: OpenAPIExample };
+  examples?: { [name: string]: ExampleModel };
   schema?: SchemaModel;
   name: string;
   isRequestType: boolean;
@@ -33,7 +33,7 @@ export class MediaTypeModel {
       this.examples = mapValues(info.examples, example => new ExampleModel(parser, example));
     } else if (info.example !== undefined) {
       this.examples = {
-        default: new ExampleModel(parser, { value: info.example }),
+        default: new ExampleModel(parser, { value: parser.shalowDeref(info.example) }),
       };
     } else if (isJsonLike(name)) {
       this.generateExample(parser, info);
@@ -49,28 +49,20 @@ export class MediaTypeModel {
     if (this.schema && this.schema.oneOf) {
       this.examples = {};
       for (const subSchema of this.schema.oneOf) {
-        const sample = Sampler.sample(
-          subSchema.rawSchema,
-          samplerOptions,
-          parser.spec,
-        );
+        const sample = Sampler.sample(subSchema.rawSchema, samplerOptions, parser.spec);
 
         if (this.schema.discriminatorProp && typeof sample === 'object' && sample) {
           sample[this.schema.discriminatorProp] = subSchema.title;
         }
 
-        this.examples[subSchema.title] = {
+        this.examples[subSchema.title] = new ExampleModel(parser, {
           value: sample,
-        };
+        });
       }
     } else if (this.schema) {
       this.examples = {
         default: new ExampleModel(parser, {
-          value: Sampler.sample(
-            info.schema,
-            samplerOptions,
-            parser.spec,
-          ),
+          value: Sampler.sample(info.schema, samplerOptions, parser.spec),
         }),
       };
     }