WIP

src/status_im/utils/ethereum/core.cljs

@@ -70,8 +70,15 @@
       network->chain-keyword
       name))
 
-(defn sha3 [s]
-  (.sha3 dependencies/Web3.prototype (str s)))
+(defn sha3
+  ([s]
+   (.sha3 dependencies/Web3.prototype (str s)))
+  ([s opts]
+   (.sha3 dependencies/Web3.prototype (str s) (clj->js opts))))
+
+(defn hex->string [s]
+  (when s
+    (.toAscii dependencies/Web3.prototype s)))
 
 (defn hex->boolean [s]
   (= s "0x0"))

src/status_im/utils/ethereum/eip165.cljs

@@ -0,0 +1,22 @@
+(ns status-im.utils.ethereum.eip165
+  "Utility function related to [EIP165](https://eips.ethereum.org/EIPS/eip-165)"
+  (:require [status-im.utils.ethereum.core :as ethereum]))
+
+(def supports-interface-hash "0x01ffc9a7")
+(def marker-hash "0xffffffff")
+
+(defn supports-interface? [web3 contract hash cb]
+  (ethereum/call web3
+                 (ethereum/call-params contract "supportsInterface(bytes4)" hash)
+                 #(cb %1 %2)))
+
+(defn supports?
+  "Calls cb with true if `supportsInterface` is supported by this contract.
+   See EIP for details."
+  [web3 contract cb]
+  (supports-interface? web3 contract supports-interface-hash
+                       #(if (true? (ethereum/hex->boolean %2))
+                          (supports-interface? web3 contract marker-hash
+                                               (fn [o oo]
+                                                 (cb o (false? (ethereum/hex->boolean oo)))))
+                          (cb %1 false))))

src/status_im/utils/ethereum/eip681.cljs

@@ -1,5 +1,5 @@
 (ns status-im.utils.ethereum.eip681
-  "Utility function related to [EIP681](https://github.com/ethereum/EIPs/issues/681)
+  "Utility function related to [EIP681](https://eips.ethereum.org/EIPS/eip-681)
 
    This EIP standardize how ethereum payment request can be represented as URI (say to embed them in a QR code).
 

src/status_im/utils/ethereum/ens.cljs

@@ -0,0 +1,73 @@
+(ns status-im.utils.ethereum.ens
+  "
+  https://docs.ens.domains/en/latest/index.html
+  https://eips.ethereum.org/EIPS/eip-137
+  https://eips.ethereum.org/EIPS/eip-181
+  "
+  (:require [clojure.string :as string]
+            [status-im.utils.ethereum.core :as ethereum]))
+
+(def registries
+  {:mainnet "0x314159265dd8dbb310642f98f50c066173c1259b"
+   :ropsten "0x112234455c3a32fd11230c42e7bccd4a84e02010"
+   :rinkeby "0xe7410170f87102DF0055eB195163A03B7F2Bff4A"})
+
+(def default-namehash "0000000000000000000000000000000000000000000000000000000000000000")
+
+(defn namehash [s]
+  (if (string/blank? s)
+    default-namehash
+    (let [[label remainder] (string/split s #"\." 2)]
+      (ethereum/sha3 (+ (namehash remainder) (subs (ethereum/sha3 label) 2)) {:encoding "hex"}))))
+
+;; Registry contract
+
+(defn resolver [web3 registry name cb]
+  (ethereum/call web3
+                 (ethereum/call-params registry "resolver(bytes32)" (namehash name))
+                 #(cb %1 (ethereum/hex->string %2))))
+
+(defn owner [web3 registry name cb]
+  (ethereum/call web3
+                 (ethereum/call-params registry "owner(bytes32)" (namehash name))
+                 #(cb %1 (ethereum/hex->string %2))))
+
+(defn ttl [web3 registry name cb]
+  (ethereum/call web3
+                 (ethereum/call-params registry "ttl(bytes32)" (namehash name))
+                 #(cb %1 (ethereum/hex->int %2))))
+
+;; Resolver contract
+
+;; Resolver must implement EIP65 (supportsInterface). When interacting with an unknown resolver it's safer to rely on it.
+
+(def addr-hash "0x3b3b57de")
+
+(defn addr [web3 resolver name cb]
+  (ethereum/call web3
+                 (ethereum/call-params resolver "addr(bytes32)" (namehash name))
+                 #(cb %1 %2)))
+
+(defn content [web3 resolver name cb]
+  (ethereum/call web3
+                 (ethereum/call-params resolver "content(bytes32)" (namehash name))
+                 #(cb %1 (ethereum/hex->string %2))))
+
+(def name-hash "0x691f3431")
+
+;; Defined by https://eips.ethereum.org/EIPS/eip-181
+
+(defn name [web3 resolver name cb]
+  (ethereum/call web3
+                 (ethereum/call-params resolver "name(bytes32)" (namehash name))
+                 #(cb %1 (ethereum/hex->string %2))))
+
+(defn text [web3 resolver name key cb]
+  (ethereum/call web3
+                 (ethereum/call-params resolver "text(bytes32,string)" (namehash name) key)
+                 #(cb %1 (ethereum/hex->string %2))))
+
+(def ABI-hash "0x2203ab56")
+(def pubkey-hash "0xc8690233")
+
+;; TODO ABI, pubkey

src/status_im/utils/ethereum/stateofus.cljs

@@ -0,0 +1,8 @@
+(ns status-im.utils.ethereum.stateofus
+  (:require [clojure.string :as string]
+            [status-im.utils.ethereum.core :as ethereum]
+            [status-im.utils.ethereum.ens :as ens]))
+
+(defn name [web3 registry name cb]
+  (ens/resolver web3 registry name
+                #(ens/name web3 %2 name cb)))

test/cljs/status_im/test/runner.cljs

@@ -35,6 +35,7 @@
             [status-im.test.utils.clocks]
             [status-im.test.utils.ethereum.eip681]
             [status-im.test.utils.ethereum.core]
+            [status-im.test.utils.ethereum.ens]
             [status-im.test.utils.random]
             [status-im.test.utils.gfycat.core]
             [status-im.test.utils.signing-phrase.core]
@@ -93,6 +94,7 @@
  'status-im.test.utils.clocks
  'status-im.test.utils.ethereum.eip681
  'status-im.test.utils.ethereum.core
+ 'status-im.test.utils.ethereum.ens
  'status-im.test.utils.random
  'status-im.test.utils.gfycat.core
  'status-im.test.utils.signing-phrase.core

test/cljs/status_im/test/utils/ethereum/ens.cljs

@@ -0,0 +1,11 @@
+(ns status-im.test.utils.ethereum.ens
+  (:require [cljs.test :refer-macros [deftest is testing]]
+            [status-im.utils.ethereum.ens :as ens]))
+
+(deftest namehash
+  (is (= ens/default-namehash (ens/namehash nil)))
+  (is (= ens/default-namehash (ens/namehash "")))
+  (is (= "0x93cdeb708b7545dc668eb9280176169d1c33cfd8ed6f04690a0bcc88a93fc4ae"
+         (ens/namehash "eth")))
+  (is (= "0xde9b09fd7c5f901e23a3f19fecc54828e9c848539801e86591bd9801b019f84f"
+         (ens/namehash "foo.eth"))))