server: sanitize html using ammonia

Cargo.lock

@@ -36,6 +36,19 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "ammonia"
+version = "3.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64e6d1c7838db705c9b756557ee27c384ce695a1c51a6fe528784cb1c6840170"
+dependencies = [
+ "html5ever 0.26.0",
+ "maplit",
+ "once_cell",
+ "tendril",
+ "url 2.4.1",
+]
+
 [[package]]
 name = "android-tzdata"
 version = "0.1.1"
@@ -1261,7 +1274,21 @@ checksum = "e5c13fb08e5d4dfc151ee5e88bae63f7773d61852f3bdc73c9f4b9e1bde03148"
 dependencies = [
  "log 0.4.20",
  "mac",
- "markup5ever",
+ "markup5ever 0.10.1",
+ "proc-macro2 1.0.66",
+ "quote 1.0.33",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "html5ever"
+version = "0.26.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bea68cab48b8459f17cf1c944c67ddc572d272d9f2b274140f223ecb1da4a3b7"
+dependencies = [
+ "log 0.4.20",
+ "mac",
+ "markup5ever 0.11.0",
  "proc-macro2 1.0.66",
  "quote 1.0.33",
  "syn 1.0.109",
@@ -1523,7 +1550,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ea8e9c6e031377cff82ee3001dc8026cdf431ed4e2e6b51f98ab8c73484a358"
 dependencies = [
  "cssparser 0.27.2",
- "html5ever",
+ "html5ever 0.25.2",
  "matches",
  "selectors",
 ]
@@ -1637,6 +1664,12 @@ dependencies = [
  "quoted_printable",
 ]
 
+[[package]]
+name = "maplit"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e2e65a1a2e43cfcb47a895c4c8b10d1f4a61097f9f254f183aee60cad9c651d"
+
 [[package]]
 name = "markup5ever"
 version = "0.10.1"
@@ -1645,7 +1678,21 @@ checksum = "a24f40fb03852d1cdd84330cddcaf98e9ec08a7b7768e952fad3b4cf048ec8fd"
 dependencies = [
  "log 0.4.20",
  "phf 0.8.0",
- "phf_codegen",
+ "phf_codegen 0.8.0",
+ "string_cache",
+ "string_cache_codegen",
+ "tendril",
+]
+
+[[package]]
+name = "markup5ever"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a2629bb1404f3d34c2e921f21fd34ba00b206124c81f65c50b43b6aaefeb016"
+dependencies = [
+ "log 0.4.20",
+ "phf 0.10.1",
+ "phf_codegen 0.10.0",
  "string_cache",
  "string_cache_codegen",
  "tendril",
@@ -2081,6 +2128,16 @@ dependencies = [
  "phf_shared 0.8.0",
 ]
 
+[[package]]
+name = "phf_codegen"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fb1c3a8bc4dd4e5cfce29b44ffc14bedd2ee294559a294e2a4d4c9e9a6a13cd"
+dependencies = [
+ "phf_generator 0.10.0",
+ "phf_shared 0.10.0",
+]
+
 [[package]]
 name = "phf_generator"
 version = "0.8.0"
@@ -2767,7 +2824,7 @@ dependencies = [
  "log 0.4.20",
  "matches",
  "phf 0.8.0",
- "phf_codegen",
+ "phf_codegen 0.8.0",
  "precomputed-hash",
  "servo_arc",
  "smallvec",
@@ -2836,6 +2893,7 @@ dependencies = [
 name = "server"
 version = "0.1.0"
 dependencies = [
+ "ammonia",
  "async-graphql",
  "async-graphql-rocket",
  "glog",