ethereum · NinaLua · Mar 7, 2025
@@ -1,13 +1,13 @@
 ---
 eip: 107
 title: safe "eth_sendTransaction" authorization via html popup
 author: Ronan Sandford (@wighawag)
 created: 2016-06-05
 status: Stagnant
 type: Standards Track
 category: Interface
 ---

 ## Abstract

 This draft EIP describes the details of an authorization method that if provided by rpc enabled ethereum nodes would allow regular websites to send transactions (via ```eth_sendTransaction```) without the need to enable CORS. Instead, user would be asked to confirm the transaction via an html popup.
@@ -17,7 +17,7 @@
 ## Motivation

 Currently, if a user navigates to a dapp running on a website using her/his everyday browser, the dapp will by default have no access to the rpc api for security reasons. The user will have to enable CORS for the website's domain in order for the dapp to work. Unfortunately if the user does so, the dapp will be able to send transactions from any unlocked account without the need for any user consent. In other words, not only does the user need to change the node's default setting, but the user is also forced to trust the dapp in order to use it. This is of course not acceptable and forces existing dapps to rely on the use of workarounds like:
 - if the transaction is a plain ether transfer, the user is asked to enter it in a dedicated trusted wallet like "Mist"
 - For more complex case, the user is asked to enter the transaction manually via the node command line interface.


@@ -61,7 +61,7 @@

 In both iframe mode and window mode, the communication with the dapp is achieved using ```window.postMessage```.
 The fist message the iframe/window sends is a message containing the string "ready" to let the dapp know that it now accepts messages. Then the dapp can start performing rpc call by sending message using the following object :
 ```
 {
  id:<a an id>, //so responses can be match as there is no guarantee of the order of the response
  payload:<json rpc object> //this is the exact object that usually send to the node
@@ -73,7 +73,7 @@
 Upon receiving such message, the iframe will perform the actual rpc call to the node but only if such a call is a read only call (not requiring an unlocked key). If it is not it will return a error. The window on the other will only accept ```eth_sendTransaction``` calls but will display a dialog so the user can accept or cancel the request.

 In all the cases, the iframe/window will send a message back to the dapp using the following object:
 ```
 {
  id:<id matching the request>,
  result:<rpc result as is>,
@@ -82,7 +82,7 @@
 ```

 the error object cannot be a javascript Error object due to postMessage limitation. Instead it is
 ```
 {
  message:<a string describing the error>,
  type:<a string defining the type of error> //type="cancel" means the user cancel the transaction
@@ -95,10 +95,10 @@
 The design for that proposal was chosen for its simplicity and security. A previous idea was to use an oauth-like protocol in order for the user to accept or deny a transaction request. It would have required deeper code change in the node and some geth contributors argues that such change did not fit into geth code base as it would have required dapp aware code.
 The current design, instead has a very simple implementation (self contained html file that can be shared across node's implementation) and its safeness is guaranteed by browsers' cross domain policies.

 The use of iframe/ window was required to have both security and user friendliness. The invisible iframe allows the dapp to execute read only calls without the need for user input, and the window ensures user approval before making a call. While we could have made it without the window mode by making the iframe confirmation use the native browser ```window.confirm``` dialog, this would have prevented the use of a more elegant confirmation popup that the current design allows. It also happens to be that the ```window.confirm``` is not safe in some browsers, as it gives focus to the accept option and can be triggered automatically (https://bugs.chromium.org/p/chromium/issues/detail?id=260653).


 ## Implementations

 In order to implement this design, the following html file or an equivalent one needs to be served at the url \<node url\>/authorization.html

@@ -115,7 +115,7 @@
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