feat(lambda-tiler): update imagery layer attributions to show licensor details BM-897 (#3357)

### Motivation

As an Imagery Data Maintainer, I want to ensure that imagery is
attributed to the correct licensor(s) for all published surveys so that
councils and government departments receive appropriate recognition.

---

### Attribution Types

|| Compact | Extended |
| - | - | - |
| Template | © `stac_license` `licensor_names` | © `stac_license`
`licensor_names` - `tileset_info` |
| Example | © CC BY 4.0 Otago Regional Council | © CC BY 4.0 Otago
Regional Council - Otago 0.3 Rural Aerial Photos (2017-2019) |

---

### Modifications

#### packages/config-loader

- Updated the package so that it copies through `providers` metadata
when generating config files.

#### packages/lambda-tiler

- Updated the attribution endpoint to include `providers` metadata as
part of collections when returning `AttributionStac` responses.

- Updated the style endpoint to include a _compact attribution_ on
sources when returning `StyleJson` responses.

#### packages/attribution

- Updated the attribution class to return an _extended attribution_ for
the bottom-right of the landing page.

### Verification

#### packages/lambda-tiler

1. Implemented a test suite for the style endpoint to ensure it
generates the correct _compact attribution_ for a given tileset.

#### packages/attribution

5. Implemented a test suite to verify that the new utility function
`createLicensorAttribution()` generates the correct _compact
attribution_ for a given list of providers.

---

### Example

Layer: Top of the South 0.15m Flood Aerial Photos (2022)

> To recreate this example, you will need to locally download the
`collection.json` file and at least one of the .TIFF files. You will
then need to run them through the `cogify` process and serve them using
the `server` package.

#### Landing Page

Screenshot showing the _extended attribution_ for the bottom-right of
the landing page.

![top-of-the-south-flood-2022-0
15m](https://github.com/user-attachments/assets/d90bb27c-0b66-41c1-91b8-402a5e10e2bc)

#### Styles Endpoint

`/v1/styles/:styleName.json`

Excerpt from the JSON response showing the provider metadata:

```json
{
    ...
    "collections": [
        {
            ...
            "providers": [
                {
                    "name": "Nelson City Council",
                    "roles": [
                        "licensor"
                    ]
                },
                {
                    "name": "Tasman District Council",
                    "roles": [
                        "licensor"
                    ]
                },
                {
                    "name": "Waka Kotahi",
                    "roles": [
                        "licensor"
                    ]
                },
                ...
            ],
            ...
        }
    ],
    ...
}
```

#### Attribution Endpoint

`/v1/tiles/:tileSet/:tileMatrix/attribution.json`

Excerpt from the JSON response showing the _compact attribution_ for the
layer source:

```json
{
    ...
    "sources": {
        "basemaps-top-of-the-south-flood-2022-0.15m": {
            ...
            "attribution": "© CC BY 4.0 Nelson City Council, Tasman District Council, Waka Kotahi",
            ...
        }
    },
    ...
}
```

Author: tawera-manaena

packages/attribution/src/__tests__/utils.test.ts

@@ -0,0 +1,65 @@
+import { strictEqual } from 'node:assert';
+import { describe, it } from 'node:test';
+
+import { StacProvider } from '@basemaps/geo';
+
+import { copyright, createLicensorAttribution } from '../utils.js';
+
+const defaultAttribution = `${copyright} LINZ`;
+
+describe('utils', () => {
+  const FakeHost: StacProvider = {
+    name: 'FakeHost',
+    roles: ['host'],
+  };
+  const FakeLicensor1: StacProvider = {
+    name: 'FakeLicensor1',
+    roles: ['licensor'],
+  };
+  const FakeLicensor2: StacProvider = {
+    name: 'FakeLicensor2',
+    roles: ['licensor'],
+  };
+
+  it('default attribution: no providers', () => {
+    const providers = undefined;
+    const attribution = createLicensorAttribution(providers);
+
+    strictEqual(attribution, defaultAttribution);
+  });
+
+  it('default attribution: empty providers', () => {
+    const providers: StacProvider[] = [];
+    const attribution = createLicensorAttribution(providers);
+
+    strictEqual(attribution, defaultAttribution);
+  });
+
+  it('default attribution: one provider, no licensors', () => {
+    const providers = [FakeHost];
+
+    const attribution = createLicensorAttribution(providers);
+    strictEqual(attribution, defaultAttribution);
+  });
+
+  it('custom attribution: one provider, one licensor', () => {
+    const providers = [FakeLicensor1];
+
+    const attribution = createLicensorAttribution(providers);
+    strictEqual(attribution, `${copyright} ${FakeLicensor1.name}`);
+  });
+
+  it('custom attribution: two providers, one licensor', () => {
+    const providers = [FakeHost, FakeLicensor1];
+
+    const attribution = createLicensorAttribution(providers);
+    strictEqual(attribution, `${copyright} ${FakeLicensor1.name}`);
+  });
+
+  it('custom attribution: two providers, two licensors', () => {
+    const providers = [FakeLicensor1, FakeLicensor2];
+
+    const attribution = createLicensorAttribution(providers);
+    strictEqual(attribution, `${copyright} ${FakeLicensor1.name}, ${FakeLicensor2.name}`);
+  });
+});

packages/attribution/src/attribution.ts

@@ -1,6 +1,8 @@
 import { AttributionCollection, AttributionStac } from '@basemaps/geo';
 import { BBox, intersection, MultiPolygon, Ring, Wgs84 } from '@linzjs/geojson';
 
+import { createLicensorAttribution } from './utils.js';
+
 export interface AttributionFilter {
   extent: BBox;
   zoom: number;
@@ -181,20 +183,66 @@ export class Attribution {
   isIgnored?: (attr: AttributionBounds) => boolean;
 
   /**
-   * Render the filtered attributions as a simple string suitable to display as attribution
+   * Parse the filtered list of attributions into a formatted string comprising license information.
+   *
+   * @param filtered The filtered list of attributions.
+   *
+   * @returns A formatted license string.
+   *
+   * @example
+   * if (filtered[0] contains no providers or licensors):
+   * return "CC BY 4.0 LINZ - Otago 0.3 Rural Aerial Photos (2017-2019)"
+   *
+   * @example
+   * if (filtered[0] contains licensors):
+   * return "CC BY 4.0 Otago Regional Council - Otago 0.3 Rural Aerial Photos (2017-2019)"
+   */
+  renderLicense(filtered: AttributionBounds[]): string {
+    const providers = filtered[0]?.collection.providers;
+    const attribution = createLicensorAttribution(providers);
+    const list = this.renderList(filtered);
+
+    if (list.length > 0) {
+      return `${attribution} - ${list}`;
+    } else {
+      return attribution;
+    }
+  }
+
+  /**
+   * Render the filtered attributions as a simple string suitable to display as attribution.
+   *
+   * @param filtered The filtered list of attributions.
+   *
+   * @returns {string} An empty string, if the filtered list is empty.
+   * Otherwise, a formatted string comprising attribution details.
+   *
+   * @example
+   * if (filtered.length === 0):
+   * return ""
+   *
+   * @example
+   * if (filtered.length === 1):
+   * return "Ashburton 0.1m Urban Aerial Photos (2023)"
+   *
+   * @example
+   * if (filtered.length === 2):
+   * return "Wellington 0.3m Rural Aerial Photos (2021) & New Zealand 10m Satellite Imagery (2023-2024)"
    *
-   * @param list the filtered list of attributions
+   * @example
+   * if (filtered.length > 2):
+   * return "Canterbury 0.2 Rural Aerial Photos (2020-2021) & others 2012-2024"
    */
-  renderList(list: AttributionBounds[]): string {
-    if (list.length === 0) return '';
-    let result = escapeHtml(list[0].collection.title);
-    if (list.length > 1) {
-      if (list.length === 2) {
-        result += ` & ${escapeHtml(list[1].collection.title)}`;
+  renderList(filtered: AttributionBounds[]): string {
+    if (filtered.length === 0) return '';
+    let result = escapeHtml(filtered[0].collection.title);
+    if (filtered.length > 1) {
+      if (filtered.length === 2) {
+        result += ` & ${escapeHtml(filtered[1].collection.title)}`;
       } else {
-        let [minYear, maxYear] = getYears(list[1].collection);
-        for (let i = 1; i < list.length; ++i) {
-          const [a, b] = getYears(list[i].collection);
+        let [minYear, maxYear] = getYears(filtered[1].collection);
+        for (let i = 1; i < filtered.length; ++i) {
+          const [a, b] = getYears(filtered[i].collection);
           if (a !== -1 && (minYear === -1 || a < minYear)) minYear = a;
           if (b !== -1 && (maxYear === -1 || b > maxYear)) maxYear = b;
         }

packages/attribution/src/utils.ts

@@ -0,0 +1,25 @@
+import { Stac, StacProvider } from '@basemaps/geo';
+
+export const copyright = `© ${Stac.License}`;
+
+/**
+ * Create a licensor attribution string.
+ *
+ * @param providers The optional list of providers.
+ *
+ * @returns A copyright string comprising the names of licensor providers.
+ *
+ * @example
+ * "CC BY 4.0 LINZ"
+ *
+ * @example
+ * "CC BY 4.0 Nelson City Council, Tasman District Council, Waka Kotahi"
+ */
+export function createLicensorAttribution(providers?: StacProvider[]): string {
+  if (providers == null) return `${copyright} LINZ`;
+
+  const licensors = providers.filter((p) => p.roles?.includes('licensor'));
+  if (licensors.length === 0) return `${copyright} LINZ`;
+
+  return `${copyright} ${licensors.map((l) => l.name).join(', ')}`;
+}

packages/config-loader/src/json/tiff.config.ts

@@ -384,6 +384,7 @@ export async function initImageryFromTiffUrl(
       noData: params.noData,
       files: params.files,
       collection: stac ?? undefined,
+      providers: stac?.providers,
     };
     imagery.overviews = await ConfigJson.findImageryOverviews(imagery);
     log?.info({ title, imageryName, files: imagery.files.length }, 'Tiff:Loaded');

packages/config/src/config/imagery.ts

@@ -46,6 +46,34 @@ export const ConfigImageryOverviewParser = z
   })
   .refine((obj) => obj.minZoom < obj.maxZoom);
 
+/**
+ * Provides information about a provider.
+ *
+ * @link https://github.com/radiantearth/stac-spec/blob/master/commons/common-metadata.md#provider
+ */
+export const ProvidersParser = z.object({
+  /**
+   * The name of the organization or the individual.
+   */
+  name: z.string(),
+
+  /**
+   * Multi-line description to add further provider information such as processing details
+   * for processors and producers, hosting details for hosts or basic contact information.
+   */
+  description: z.string().optional(),
+
+  /**
+   * Roles of the provider. Any of `licensor`, `producer`, `processor` or `host`.
+   */
+  roles: z.array(z.string()).optional(),
+
+  /**
+   * Homepage on which the provider describes the dataset and publishes contact information.
+   */
+  url: z.string().optional(),
+});
+
 export const BoundingBoxParser = z.object({ x: z.number(), y: z.number(), width: z.number(), height: z.number() });
 export const NamedBoundsParser = z.object({
   /**
@@ -140,6 +168,11 @@ export const ConfigImageryParser = ConfigBase.extend({
    * Separate overview cache
    */
   overviews: ConfigImageryOverviewParser.optional(),
+
+  /**
+   * list of providers and their metadata
+   */
+  providers: z.array(ProvidersParser).optional(),
 });
 
 export type ConfigImagery = z.infer<typeof ConfigImageryParser>;

packages/geo/src/stac/index.ts

@@ -21,9 +21,31 @@ export interface StacAsset {
   description?: string;
 }
 
+/**
+ * Provides information about a provider.
+ *
+ * @link https://github.com/radiantearth/stac-spec/blob/master/commons/common-metadata.md#provider
+ */
 export interface StacProvider {
+  /**
+   * The name of the organization or the individual.
+   */
   name: string;
-  roles: string[];
+
+  /**
+   * Multi-line description to add further provider information such as processing details
+   * for processors and producers, hosting details for hosts or basic contact information.
+   */
+  description?: string;
+
+  /**
+   * Roles of the provider. Any of `licensor`, `producer`, `processor` or `host`.
+   */
+  roles?: string[];
+
+  /**
+   * Homepage on which the provider describes the dataset and publishes contact information.
+   */
   url?: string;
 }