Cross-chain swap API webpack example

examples/swap-api-webpack/.env.example

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+PORT=3004
+GENERATE_SOURCEMAP=false
+DATAHUB_API_KEY=
+RPC_URL=https://cosmos-mainnet-rpc.allthatnode.com:26657

examples/swap-api-webpack/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.env
+/.yarn

examples/swap-api-webpack/README.md

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+
+The Cross-chain Swap feature is used for sending and signing an API transaction with Metamask, Keplr, Ton, and MultiversX wallets.
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.\
+Open [http://localhost:3004](http://localhost:3004) to view it in the browser.
+
+The page will reload if you make edits.\
+You will also see any lint errors in the console.
+
+
+## Swing integration
+
+The [@swing.xyz/api](https://developers.swing.xyz/reference/api) Here you will find helpful API guides and references to integrate Swing API directly into your dApp, web or mobile application.
+

examples/swap-api-webpack/config-overrides.js

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+require("dotenv").config()
+const webpack = require("webpack")
+
+module.exports = function override(config, env) {
+    config.plugins.push(
+        new webpack.ProvidePlugin({
+            Buffer: ["buffer", "Buffer"],
+        }),
+        new webpack.EnvironmentPlugin(["RPC_URL"]),
+    )
+    config.module.rules.push({
+        test: /\.m?js/,
+        resolve: {
+          fullySpecified: false,
+        },
+    })
+    config.resolve.fallback = {
+        buffer: false,
+        crypto: false,
+        events: false,
+        path: false,
+        stream: false,
+        fs: false,
+        string_decoder: false,
+        os: false,
+        url: false,
+    }
+    return config
+}

examples/swap-api-webpack/main.go

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+package main
+
+import (
+    "flag"
+    "fmt"
+    "io/ioutil"
+    "log"
+    "net/http"
+)
+
+var hostname string
+var port int
+
+func main() {
+    // flags declaration using flag package
+    // flag.StringVar(&hostname, "H", "https://rpc-cosmoshub.keplr.app", "Specify hostname")
+		flag.StringVar(&hostname, "H", "https://rpc.cosmos.network", "Specify hostname")
+    flag.IntVar(&port, "p", 8081, "Specify port")
+
+    flag.Parse() // after declaring flags we
+    http.HandleFunc("/", serveCorsProxy)
+    log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", port), nil))
+}
+
+// Serve a reverse proxy for a given url
+func serveCorsProxy(res http.ResponseWriter, req *http.Request) {
+    proxyRequest, err := http.NewRequest(req.Method, hostname, req.Body)
+    proxyRequest.URL.Path = req.URL.Path
+    proxyRequest.URL.RawQuery = req.URL.RawQuery
+    if err != nil {
+        fmt.Printf("create request error: %v", err)
+        return
+    }
+    response, err := http.DefaultClient.Do(proxyRequest)
+    if err != nil {
+        fmt.Printf("proxy request error: %v", err)
+        return
+    }
+    setHeaders(response, &res)
+    body, err := ioutil.ReadAll(response.Body)
+    if err != nil {
+        fmt.Printf("response read error: %v", err)
+        return
+    }
+		fmt.Printf("Running...")
+    res.WriteHeader(response.StatusCode)
+    _, _ = res.Write(body)
+}
+
+func setHeaders(src *http.Response, dest *http.ResponseWriter) {
+    header := (*dest).Header()
+    for name, values := range (*src).Header {
+        for _, value := range values {
+            header.Set(name, value)
+        }
+    }
+    header.Set("access-control-allow-headers", "Accept,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Requested-With")
+    header.Set("access-control-allow-methods", "GET, POST, OPTIONS")
+    header.Set("access-control-allow-origin", "http://localhost:3001")
+    header.Set("access-control-expose-headers", "Content-Length,Content-Range")
+    header.Set("access-control-max-age", "1728000")
+}