Replace GraphicsMagick with sharp

That was easier than I expected.

Closes #18.

README.md

@@ -58,9 +58,7 @@ If you only use one computer, you can install Bibliogram on that computer and th
 
 ## Installing
 
-Bibliogram depends on GraphicsMagick for resizing thumbnails.
+You need [node.js](https://nodejs.org/en/) to run Bibliogram. Versions before 12.13.0 are untested.
-
-Ubuntu: `# apt install graphicsmagick`
 
 1. `$ git clone https://github.com/cloudrac3r/bibliogram`  
 If you are using a fork, be sure to actually install that fork instead!

package-lock.json

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@@ -248,6 +258,11 @@
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@@ -379,6 +426,14 @@
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@@ -441,6 +501,19 @@
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@@ -503,6 +576,11 @@
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@@ -972,6 +1088,11 @@
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+        "nan": "^2.14.0",
+        "npmlog": "^4.1.2",
+        "prebuild-install": "^5.3.3",
+        "semver": "^7.1.1",
+        "simple-get": "^3.1.0",
+        "tar": "^5.0.5",
+        "tunnel-agent": "^0.6.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "7.1.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.1.1.tgz",
+          "integrity": "sha512-WfuG+fl6eh3eZ2qAf6goB7nhiCd7NPXhmyFxigB/TOkQyeLP8w8GsVehvtGNtnNmyboz4TgeK40B1Kbql/8c5A=="
+        },
+        "tar": {
+          "version": "5.0.5",
+          "resolved": "https://registry.npmjs.org/tar/-/tar-5.0.5.tgz",
+          "integrity": "sha512-MNIgJddrV2TkuwChwcSNds/5E9VijOiw7kAc1y5hTNJoLDSuIyid2QtLYiCYNnICebpuvjhPQZsXwUL0O3l7OQ==",
+          "requires": {
+            "chownr": "^1.1.3",
+            "fs-minipass": "^2.0.0",
+            "minipass": "^3.0.0",
+            "minizlib": "^2.1.0",
+            "mkdirp": "^0.5.0",
+            "yallist": "^4.0.0"
+          }
+        },
+        "yallist": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+          "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
+        }
+      }
+    },
     "signal-exit": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
       "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0="
     },
+    "simple-concat": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.0.tgz",
+      "integrity": "sha1-c0TLuLbib7J9ZrL8hvn21Zl1IcY="
+    },
+    "simple-get": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/simple-get/-/simple-get-3.1.0.tgz",
+      "integrity": "sha512-bCR6cP+aTdScaQCnQKbPKtJOKDp/hj9EDLJo3Nw4y1QksqaovlW/bnptB6/c1e+qmNIDHRK+oXFDdEqBT8WzUA==",
+      "requires": {
+        "decompress-response": "^4.2.0",
+        "once": "^1.3.1",
+        "simple-concat": "^1.0.0"
+      }
+    },
+    "simple-swizzle": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/simple-swizzle/-/simple-swizzle-0.2.2.tgz",
+      "integrity": "sha1-pNprY1/8zMoz9w0Xy5JZLeleVXo=",
+      "requires": {
+        "is-arrayish": "^0.3.1"
+      },
+      "dependencies": {
+        "is-arrayish": {
+          "version": "0.3.2",
+          "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.3.2.tgz",
+          "integrity": "sha512-eVRqCvVlZbuw3GrM63ovNSNAeA1K16kaR/LRY/92w0zxQ5/1YzwblUX652i4Xs9RwAGjW9d9y6X88t8OaAJfWQ=="
+        }
+      }
+    },
     "source-map": {
       "version": "0.4.4",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.4.4.tgz",
@@ -1560,6 +1794,11 @@
         "get-stdin": "^4.0.1"
       }
     },
+    "strip-json-comments": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
+    },
     "supports-color": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
@@ -1575,6 +1814,41 @@
         "inherits": "2"
       }
     },
+    "tar-fs": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.0.0.tgz",
+      "integrity": "sha512-vaY0obB6Om/fso8a8vakQBzwholQ7v5+uy+tF3Ozvxv1KNezmVQAiWtcNmMHFSFPqL3dJA8ha6gdtFbfX9mcxA==",
+      "requires": {
+        "chownr": "^1.1.1",
+        "mkdirp": "^0.5.1",
+        "pump": "^3.0.0",
+        "tar-stream": "^2.0.0"
+      }
+    },
+    "tar-stream": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.1.0.tgz",
+      "integrity": "sha512-+DAn4Nb4+gz6WZigRzKEZl1QuJVOLtAwwF+WUxy1fJ6X63CaGaUAxJRD2KEn1OMfcbCjySTYpNC6WmfQoIEOdw==",
+      "requires": {
+        "bl": "^3.0.0",
+        "end-of-stream": "^1.4.1",
+        "fs-constants": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.1.1"
+      },
+      "dependencies": {
+        "readable-stream": {
+          "version": "3.5.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.5.0.tgz",
+          "integrity": "sha512-gSz026xs2LfxBPudDuI41V1lka8cxg64E66SGe78zJlsUofOg/yqwezdIcdfwik6B4h8LFmWPA9ef9X3FiNFLA==",
+          "requires": {
+            "inherits": "^2.0.3",
+            "string_decoder": "^1.1.1",
+            "util-deprecate": "^1.0.1"
+          }
+        }
+      }
+    },
     "to-fast-properties": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-1.0.3.tgz",
@@ -1731,6 +2005,11 @@
       "resolved": "https://registry.npmjs.org/which-module/-/which-module-1.0.0.tgz",
       "integrity": "sha1-u6Y8qGGUiZT/MHc2CJ47lgJsKk8="
     },
+    "which-pm-runs": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
+      "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs="
+    },
     "wide-align": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",

package.json

@@ -10,11 +10,11 @@
   "author": "",
   "license": "AGPL-3.0-only",
   "dependencies": {
-    "gm": "^1.23.1",
     "mixin-deep": "^2.0.1",
     "node-dir": "^0.1.17",
     "node-fetch": "^2.6.0",
     "pinski": "github:cloudrac3r/pinski#19495f7a1c62fbfd8c685cf5bb5d678788906032",
-    "rss": "^1.2.2"
+    "rss": "^1.2.2",
+    "sharp": "^0.24.0"
   }
 }

src/site/api/proxy.js

@@ -1,7 +1,7 @@
 const constants = require("../../lib/constants")
 const {request} = require("../../lib/utils/request")
 const {proxy} = require("pinski/plugins")
-const gm = require("gm")
+const sharp = require("sharp")
 
 module.exports = [
 	{route: "/imageproxy", methods: ["GET"], code: async (input) => {
@@ -23,36 +23,24 @@ module.exports = [
 		const width = +params.get("width")
 		if (typeof width === "number" && !isNaN(width) && width > 0) {
 			/*
-				This uses graphicsmagick to force crop the image to a square.
+				This uses sharp to force crop the image to a square.
-				Some thumbnails aren't square and will be stretched on the page without this.
+				"entropy" seems to currently work better than "attention" on the thumbnail of this shortcode: B55yH20gSl0
+				Some thumbnails aren't square and would otherwise be stretched on the page without this.
 				If I cropped the images client side, it would have to be done with CSS background-image, which means no <img srcset>.
 			*/
 			return request(url).then(res => {
-				const image = gm(res.body).gravity("Center").crop(width, width, 0, 0).repage("+")
+				const converter = sharp().resize(width, width, {position: "entropy"})
 				return {
 					statusCode: 200,
 					contentType: "image/jpeg",
 					headers: {
 						"Cache-Control": constants.caching.image_cache_control
 					},
-					stream: image.stream("jpg")
+					stream: res.body.pipe(converter)
 				}
-				/*
-					Alternative buffer-based method for sending file:
-
-					return new Promise(resolve => {
-						image.toBuffer((err, buffer) => {
-							if (err) console.error(err)
-							resolve({
-								statusCode: 200,
-								contentType: "image/jpeg",
-								content: buffer
-							})
-						})
-					})
-				*/
 			})
 		} else {
+			// No specific size was requested, so just stream proxy the file directly.
 			return proxy(url, {
 				"Cache-Control": constants.caching.image_cache_control
 			})