Initial checkin

.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/go-hibp.iml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="Go" enabled="true" />
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,12 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="GrazieInspection" enabled="false" level="TYPO" enabled_by_default="false" />
+    <inspection_tool class="LanguageDetectionInspection" enabled="false" level="WARNING" enabled_by_default="false" />
+    <inspection_tool class="SpellCheckingInspection" enabled="false" level="TYPO" enabled_by_default="false">
+      <option name="processCode" value="true" />
+      <option name="processLiterals" value="true" />
+      <option name="processComments" value="true" />
+    </inspection_tool>
+  </profile>
+</component>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/go-hibp.iml" filepath="$PROJECT_DIR$/.idea/go-hibp.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

go.mod

@@ -0,0 +1,3 @@
+module github.com/wneessen/go-hibp
+
+go 1.17

hibp.go

@@ -0,0 +1,44 @@
+package go_hibp
+
+import (
+	"bufio"
+	"crypto/sha1"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+)
+
+// HIBPUrl represents the main API url for the HIBP password API
+const HIBPUrl = "https://api.pwnedpasswords.com/range/"
+
+// Check queries the HIBP database and checks if a given string is was found
+func Check(p string) (ip bool, err error) {
+	shaSum := fmt.Sprintf("%x", sha1.Sum([]byte(p)))
+	fp := shaSum[0:5]
+	sp := shaSum[5:]
+	ip = false
+
+	httpClient := &http.Client{Timeout: time.Second * 2}
+	httpRes, err := httpClient.Get(HIBPUrl + fp)
+	if err != nil {
+		return false, err
+	}
+	defer func() {
+		err = httpRes.Body.Close()
+	}()
+
+	scanObj := bufio.NewScanner(httpRes.Body)
+	for scanObj.Scan() {
+		scanLine := strings.SplitN(scanObj.Text(), ":", 2)
+		if strings.ToLower(scanLine[0]) == sp {
+			ip = true
+			break
+		}
+	}
+	if err := scanObj.Err(); err != nil {
+		return ip, err
+	}
+
+	return ip, nil
+}