+ GetSharedElementsOfStringSlices

comparisons.go

@@ -0,0 +1,39 @@
+package utils
+
+// GetSharedElementsOfStringSlices finds the elements that are in both slices
+func GetSharedElementsOfStringSlices(a, b []string) []string {
+	// Create a map to store the elements of "b"
+	mapOfElementsOfSliceB := make(map[string]bool)
+	for _, e := range b {
+		mapOfElementsOfSliceB[e] = true
+	}
+
+	// Iterate through "a" and find the elements that are not in "b"
+	var sharedElementsOfBothSlices []string
+	for _, e := range a {
+		if mapOfElementsOfSliceB[e] {
+			sharedElementsOfBothSlices = append(sharedElementsOfBothSlices, e)
+		}
+	}
+
+	return sharedElementsOfBothSlices
+}
+
+// GetUniqueElementsOfStringSlices finds the elements that are in the first slice but not in the second slice
+func GetUniqueElementsOfStringSlices(a, b []string) []string {
+	// Create a map to store the elements of "b"
+	mapOfElementsOfSliceB := make(map[string]bool)
+	for _, e := range b {
+		mapOfElementsOfSliceB[e] = true
+	}
+
+	// Iterate through "a" and find the elements that are not in "b"
+	var uniqueElementsOfSliceA []string
+	for _, e := range a {
+		if !mapOfElementsOfSliceB[e] {
+			uniqueElementsOfSliceA = append(uniqueElementsOfSliceA, e)
+		}
+	}
+
+	return uniqueElementsOfSliceA
+}

comparisons_test.go

@@ -0,0 +1,93 @@
+package utils
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestGetSharedElementsOfStringSlices(t *testing.T) {
+	data := []map[string][]string{
+		{
+			"a":              []string{"apple", "banana", "cherry"},
+			"b":              []string{"banana", "cherry", "date", "fig"},
+			"expectedResult": []string{"banana", "cherry"},
+		},
+		{
+			"a":              []string{"banana", "cherry", "date", "fig"},
+			"b":              []string{"apple", "banana", "cherry"},
+			"expectedResult": []string{"banana", "cherry"},
+		},
+		{
+			"a":              []string{"apple", "banana", "cherry"},
+			"b":              []string{"apple", "banana", "cherry"},
+			"expectedResult": []string{"apple", "banana", "cherry"},
+		},
+		{
+			"a":              []string{},
+			"b":              []string{"apple", "banana", "cherry"},
+			"expectedResult": []string{},
+		},
+		{
+			"a":              []string{"apple", "banana", "cherry"},
+			"b":              []string{},
+			"expectedResult": []string{},
+		},
+		{
+			"a":              []string{},
+			"b":              []string{},
+			"expectedResult": []string{},
+		},
+	}
+
+	for _, test := range data {
+		result := GetSharedElementsOfStringSlices(test["a"], test["b"])
+		if !reflect.DeepEqual(result, test["expectedResult"]) {
+			if len(result) == 0 && len(test["expectedResult"]) == 0 {
+				continue
+			}
+
+			t.Errorf("\ngot:    %q\nwanted: %q\nfor:    %q", result, test["expectedResult"], test)
+		}
+	}
+}
+
+func TestGetUniqueElementsOfStringSlices(t *testing.T) {
+	data := []map[string][]string{
+		{
+			"a":              []string{"apple", "banana", "cherry"},
+			"b":              []string{"banana", "cherry", "date", "fig"},
+			"expectedResult": []string{"apple"},
+		},
+		{
+			"a":              []string{"banana", "cherry", "date", "fig"},
+			"b":              []string{"apple", "banana", "cherry"},
+			"expectedResult": []string{"date", "fig"},
+		},
+		{
+			"a":              []string{"apple", "banana", "cherry"},
+			"b":              []string{"apple", "banana", "cherry"},
+			"expectedResult": []string{},
+		},
+		{
+			"a":              []string{},
+			"b":              []string{"apple", "banana", "cherry"},
+			"expectedResult": []string{},
+		},
+		{
+			"a":              []string{"apple", "banana", "cherry"},
+			"b":              []string{},
+			"expectedResult": []string{"apple", "banana", "cherry"},
+		},
+	}
+
+	for _, test := range data {
+		result := GetUniqueElementsOfStringSlices(test["a"], test["b"])
+		if !reflect.DeepEqual(result, test["expectedResult"]) {
+			if len(result) == 0 && len(test["expectedResult"]) == 0 {
+				continue
+			}
+
+			t.Errorf("\ngot:    %q\nwanted: %q\nfor:    %q", result, test["expectedResult"], test)
+		}
+	}
+}

filesystem.go

@@ -0,0 +1,108 @@
+package utils
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+)
+
+// AppendLineToFile appends the line l to file
+func AppendLineToFile(file string, l string) error {
+	f, err := os.OpenFile(file, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0660)
+	if err != nil {
+		return err
+	}
+
+	defer f.Close()
+
+	if _, err = f.WriteString(l + "\n"); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// CreateFolder creates a the folder f
+func CreateFolder(f string) error {
+	err := os.Mkdir(f, 0700)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// GetAllFilesInFolderByExtension returns all files by extension of a given folder recursively
+func GetAllFilesInFolderByExtension(pathToFolder string, extension string) []string {
+	files := []string{}
+
+	filepath.Walk(pathToFolder,
+		func(path string, info os.FileInfo, err error) error {
+			if err != nil {
+				return err
+			}
+			if info.IsDir() {
+				return nil
+			}
+			if filepath.Ext(path) != extension {
+				return nil
+			}
+			files = append(files, path)
+			return nil
+		})
+
+	return files
+}
+
+// GetPathToParrentFolderOfThisExecutable returns the path to the folder where this executable is located
+func GetPathToParrentFolderOfThisExecutable() string {
+	return filepath.Dir(GetPathToThisExecutable())
+}
+
+// GetPathToThisExecutable returns the path where this executable is located
+func GetPathToThisExecutable() string {
+	e, err := os.Executable()
+	if err != nil {
+		return "."
+	}
+
+	return e
+}
+
+// GetSizeOfFileInBytes returns the size of a file in bytes
+func GetSizeOfFileInBytes(p string) (int64, error) {
+	if !DoesFileExist(p) {
+		return 0, errors.New("not a file or does not exist")
+	}
+
+	fileInfo, err := os.Stat(p)
+	if err != nil {
+		return 0, err
+	}
+
+	return fileInfo.Size(), nil
+}
+
+// LoadStringFromFile writes a string to a file
+func LoadStringFromFile(pathOfFile string) (string, error) {
+	if !DoesFileExist(pathOfFile) {
+		return "", errors.New("file " + pathOfFile + "does not exist")
+	}
+
+	fileContent, err := os.ReadFile(pathOfFile)
+	if err != nil {
+		return "", errors.New("could not read file " + pathOfFile)
+	}
+
+	return string(fileContent), nil
+}
+
+// WriteStringToFile writes a string to a file
+func WriteStringToFile(file string, s string) error {
+	err := os.WriteFile(file, []byte(s+"\n"), 0660)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

filesystem_test.go

@@ -0,0 +1,21 @@
+package utils
+
+import (
+	"testing"
+)
+
+func TestGetSizeOfFileInBytes(t *testing.T) {
+	data := map[string]int64{
+		"/usr/bin/go":     11466992, // ls -lH /usr/bin/go | awk -F ' ' '{print $5}'
+		"/etc/fstab":      1049,     // ls -lH /etc/fstab | awk -F ' ' '{print $5}'
+		"/etc/os-release": 371,      // ls -lH /etc/os-release | awk -F ' ' '{print $5}'
+		"/etc":            0,
+	}
+
+	for d, expectedResult := range data {
+		result, _ := GetSizeOfFileInBytes(d)
+		if result != expectedResult {
+			t.Errorf("\ngot:    %d\nwanted: %d\nfor:    %q", result, expectedResult, d)
+		}
+	}
+}

strings.go

@@ -52,6 +52,22 @@ func RemoveDoubledStrings(s string, target string) string {
 	)
 }
 
+// RemoveLeadingStrings removes all leading occurrences of target in s
+func RemoveLeadingStrings(s string, target string) string {
+	lenS := len(s)
+	lenTarget := len(target)
+
+	if lenS < lenTarget {
+		return s
+	}
+
+	if s[:lenTarget] != target {
+		return s
+	}
+
+	return RemoveLeadingStrings(s[lenTarget:], target)
+}
+
 // SanitizeStringWithWhitelist cleans s by all substrings which do not occur in whitelist
 func SanitizeStringWithWhitelist(s string, whitelist map[string]string) string {
 	sanitizedString := ""

strings_test.go

@@ -1,6 +1,8 @@
 package utils
 
-import "testing"
+import (
+	"testing"
+)
 
 func TestFirstCharacterToUppercase(t *testing.T) {
 	data := map[string]string{
@@ -56,6 +58,36 @@ func TestRemoveDoubledStrings(t *testing.T) {
 	}
 }
 
+func TestRemoveLeadingStrings(t *testing.T) {
+	data := map[string]string{
+		"":  "",
+		".": "",
+		"...Jahr 2022... die überleben wollen...": "Jahr 2022... die überleben wollen...",
+	}
+
+	for d, expectedResult := range data {
+		result := RemoveLeadingStrings(d, ".")
+		if result != expectedResult {
+			t.Errorf("\ngot:    %q\nwanted: %q\nfor:    %q", result, expectedResult, d)
+		}
+	}
+
+	data = map[string]string{
+		"":     "",
+		".":    ".",
+		"..":   "..",
+		"...":  "",
+		"....": ".",
+	}
+
+	for d, expectedResult := range data {
+		result := RemoveLeadingStrings(d, "...")
+		if result != expectedResult {
+			t.Errorf("\ngot:    %q\nwanted: %q\nfor:    %q", result, expectedResult, d)
+		}
+	}
+}
+
 func TestSanitizeStringWithWhitelist(t *testing.T) {
 	whitelistedChars := []string{
 		".", "-",

validators.go

@@ -1,6 +1,52 @@
 package utils
 
-import "net/url"
+import (
+	"net/url"
+	"os"
+	"regexp"
+
+	"github.com/google/uuid"
+)
+
+// DoesFileExist returns true, if a file exists (and actually is a file)
+func DoesFileExist(p string) bool {
+	s, err := os.Stat(p)
+	if os.IsNotExist(err) {
+		return false
+	}
+
+	if s.IsDir() {
+		return false
+	}
+
+	return true
+}
+
+// DoesFolderExist returns true, if a folder exists (and actually is a folder)
+func DoesFolderExist(p string) bool {
+	s, err := os.Stat(p)
+	if os.IsNotExist(err) {
+		return false
+	}
+
+	if !s.IsDir() {
+		return false
+	}
+
+	return true
+}
+
+// DoesStringContainsNonWhitelistedSubstrings returns false if s contains substrings which are not in whitelist
+func DoesStringContainsNonWhitelistedSubstrings(s string, whitelist map[string]string) bool {
+	for _, char := range s {
+		_, charIsWhitelisted := whitelist[string(char)]
+		if !charIsWhitelisted {
+			return true
+		}
+	}
+
+	return false
+}
 
 // IsStringInSliceOfStrings returns true, if slice contains target
 func IsStringInSliceOfStrings(slice []string, target string) bool {
@@ -13,8 +59,17 @@ func IsStringInSliceOfStrings(slice []string, target string) bool {
 	return false
 }
 
-// IsValidUrl returns true, if s is a valid URL
-func IsValidUrl(s string) bool {
+// IsValidEmail returns true, if s is a email address.
+func IsValidEmail(s string) bool {
+	// Used Regex instead of mail.ParseAddress(), as the latter incorrectly recognizes samples such as “bad@domain” as a valid address
+	// Shoutout to emailregex.com for the almighty regular expression
+	return regexp.MustCompile(
+		`(?:[a-z0-9!#$%&'*+/=?^_{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])`,
+	).MatchString(s)
+}
+
+// IsValidURL returns true, if s is a valid URL
+func IsValidURL(s string) bool {
 	u, err := url.Parse(s)
 	if err != nil || u.Scheme == "" || u.Host == "" {
 		return false
@@ -22,3 +77,9 @@ func IsValidUrl(s string) bool {
 
 	return true
 }
+
+// IsValidUUID returns true, if s is a valid UUID
+func IsValidUUID(s string) bool {
+	_, err := uuid.Parse(s)
+	return err == nil
+}

validators_test.go

@@ -1,6 +1,44 @@
 package utils
 
-import "testing"
+import (
+	"testing"
+)
+
+func TestDoesFileExist(t *testing.T) {
+	data := map[string]bool{
+		"/usr/bin/go":                   true,
+		"/etc/fstab":                    true,
+		"/etc/os-release":               true,
+		"/usr/bin":                      false,
+		"/home/derschmierigetypvomaldi": false,
+		"/tmp/plainTextPasswords.txt":   false,
+	}
+
+	for d, expectedResult := range data {
+		result := DoesFileExist(d)
+		if result != expectedResult {
+			t.Errorf("\ngot:    %t\nwanted: %t\nfor:    %q", result, expectedResult, d)
+		}
+	}
+}
+
+func TestDoesFolderExist(t *testing.T) {
+	data := map[string]bool{
+		"/home":                                true,
+		"/tmp":                                 true,
+		"/usr/bin":                             true,
+		"/home/derschmierigetypvomaldi":        false,
+		"/tmp/fdashfglkjdahjslkjfhjdsakljöhjf": false,
+		"/usr/bin/go":                          false,
+	}
+
+	for d, expectedResult := range data {
+		result := DoesFolderExist(d)
+		if result != expectedResult {
+			t.Errorf("\ngot:    %t\nwanted: %t\nfor:    %q", result, expectedResult, d)
+		}
+	}
+}
 
 func TestIsStringInSliceOfStrings(t *testing.T) {
 	slice1 := []string{"apple", "banana", "cherry", "date"}
@@ -36,7 +74,7 @@ func TestIsStringInSliceOfStrings(t *testing.T) {
 	}
 }
 
-func TestIsValidUrl(t *testing.T) {
+func TestIsValidURL(t *testing.T) {
 	data := map[string]bool{
 		"":                                   false,
 		"0x0001f346":                         false,
@@ -47,7 +85,50 @@ func TestIsValidUrl(t *testing.T) {
 	}
 
 	for d, expectedResult := range data {
-		result := IsValidUrl(d)
+		result := IsValidURL(d)
+		if result != expectedResult {
+			t.Errorf("\ngot:    %t\nwanted: %t\nfor:    %q", result, expectedResult, d)
+		}
+	}
+}
+
+func TestIsValidUUID(t *testing.T) {
+	data := map[string]bool{
+		"":                                     false,
+		"0x0001f346":                           false,
+		"0179eb94-7a81-11ee-b962-0242ac120002": true,
+		"c3bcd438-7a80-11ee-b962-0242ac120002": true,
+		"0a245e0a-7a81-11ee-b962-0242ac120002": true,
+		"9d90b107-fc59-45f8-a622-f55b0a1396d6": true,
+		"f327c2b7-15a5-43c4-aefb-c66c6f34a32e": true,
+		"02cb18ec-5d6a-428d-8159-643bde3f43bb": true,
+	}
+
+	for d, expectedResult := range data {
+		result := IsValidUUID(d)
+		if result != expectedResult {
+			t.Errorf("\ngot:    %t\nwanted: %t\nfor:    %q", result, expectedResult, d)
+		}
+	}
+}
+
+func TestIsValidEmail(t *testing.T) {
+	data := map[string]bool{
+		"test@example.com":          true,
+		"another.test@domain.co.uk": true,
+		"username@domain.c":         true,
+		"":                          false,
+		"invalid-email":             false,
+		"bad@domain":                false,
+		"@missingusername.com":      false,
+		"plainaddress":              false,
+		"@missingdomain":            false,
+		"missingatsign.com":         false,
+		"username@.com":             false,
+	}
+
+	for d, expectedResult := range data {
+		result := IsValidEmail(d)
 		if result != expectedResult {
 			t.Errorf("\ngot:    %t\nwanted: %t\nfor:    %q", result, expectedResult, d)
 		}