Add Chromium support and Ubuntu specific tests

This commit adds support for the Chromium user agent string and adds
user agent tests for the latest version of all major browsers available
on Ubuntu.

Fixes:
- Ignore revision field for localization (e.g. rv:50.0)
- Ignore browser name parameter without version (e.g. "Ubuntu")

Fixes #27

all_test.go

@@ -173,6 +173,11 @@ var uastrings = []struct {
 		ua:       "Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20100101 Firefox/17.0",
 		expected: "Mozilla:5.0 Platform:X11 OS:Linux x86_64 Browser:Firefox-17.0 Engine:Gecko-20100101 Bot:false Mobile:false",
 	},
+	{
+		title:    "FirefoxLinux - Ubuntu V50",
+		ua:       "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:50.0) Gecko/20100101 Firefox/50.0",
+		expected: "Mozilla:5.0 Platform:X11 OS:Ubuntu Browser:Firefox-50.0 Engine:Gecko-20100101 Bot:false Mobile:false",
+	},
 	{
 		title:    "FirefoxWin",
 		ua:       "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14",
@@ -265,6 +270,11 @@ var uastrings = []struct {
 		ua:       "Opera/9.80 (X11; Linux x86_64) Presto/2.12.388 Version/12.10",
 		expected: "Platform:X11 OS:Linux x86_64 Browser:Opera-9.80 Engine:Presto-2.12.388 Bot:false Mobile:false",
 	},
+	{
+		title:    "OperaLinux - Ubuntu V41",
+		ua:       "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36 OPR/41.0.2353.69",
+		expected: "Mozilla:5.0 Platform:X11 OS:Linux x86_64 Browser:Opera-41.0.2353.69 Engine:AppleWebKit-537.36 Bot:false Mobile:false",
+	},
 	{
 		title:    "OperaAndroid",
 		ua:       "Opera/9.80 (Android 4.2.1; Linux; Opera Mobi/ADR-1212030829) Presto/2.11.355 Version/12.10",
@@ -329,6 +339,11 @@ var uastrings = []struct {
 		ua:       "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.97 Safari/537.11",
 		expected: "Mozilla:5.0 Platform:X11 OS:Linux x86_64 Browser:Chrome-23.0.1271.97 Engine:AppleWebKit-537.11 Bot:false Mobile:false",
 	},
+	{
+		title:    "ChromeLinux - Ubuntu V55",
+		ua:       "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.75 Safari/537.36",
+		expected: "Mozilla:5.0 Platform:X11 OS:Linux x86_64 Browser:Chrome-55.0.2883.75 Engine:AppleWebKit-537.36 Bot:false Mobile:false",
+	},
 	{
 		title:    "ChromeWin7",
 		ua:       "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.168 Safari/535.19",
@@ -429,6 +444,16 @@ var uastrings = []struct {
 		ua:       "Mozilla/5.0 (SymbianOS/9.1; U; [en-us]) AppleWebKit/413 (KHTML, like Gecko) Safari/413",
 		expected: "Mozilla:5.0 Platform:Symbian OS:SymbianOS/9.1 Browser:Symbian-413 Engine:AppleWebKit-413 Bot:false Mobile:true",
 	},
+	{
+		title:    "Chromium - Ubuntu V49",
+		ua:       "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/49.0.2623.108 Chrome/49.0.2623.108 Safari/537.36",
+		expected: "Mozilla:5.0 Platform:X11 OS:Linux x86_64 Browser:Chromium-49.0.2623.108 Engine:AppleWebKit-537.36 Bot:false Mobile:false",
+	},
+	{
+		title:    "Chromium - Ubuntu V55",
+		ua:       "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/53.0.2785.143 Chrome/53.0.2785.143 Safari/537.36",
+		expected: "Mozilla:5.0 Platform:X11 OS:Linux x86_64 Browser:Chromium-53.0.2785.143 Engine:AppleWebKit-537.36 Bot:false Mobile:false",
+	},
 
 	// Dalvik
 	{

browser.go

@@ -51,7 +51,13 @@ func (p *UserAgent) detectBrowser(sections []section) {
 		p.browser.Engine = engine.name
 		p.browser.EngineVersion = engine.version
 		if slen > 2 {
-			p.browser.Version = sections[2].version
+			sectionIndex := 2
+			// The version after the engine comment is empty on e.g. Ubuntu
+			// platforms so if this is the case, let's use the next in line.
+			if sections[2].version == "" && slen > 3 {
+				sectionIndex = 3
+			}
+			p.browser.Version = sections[sectionIndex].version
 			if engine.name == "AppleWebKit" {
 				switch sections[slen-1].name {
 				case "Edge":
@@ -63,8 +69,10 @@ func (p *UserAgent) detectBrowser(sections []section) {
 					p.browser.Name = "Opera"
 					p.browser.Version = sections[slen-1].version
 				default:
-					if sections[2].name == "Chrome" {
+					if sections[sectionIndex].name == "Chrome" {
 						p.browser.Name = "Chrome"
+					} else if sections[sectionIndex].name == "Chromium" {
+						p.browser.Name = "Chromium"
 					} else {
 						p.browser.Name = "Safari"
 					}

operating_systems.go

@@ -126,7 +126,9 @@ func gecko(p *UserAgent, comment []string) {
 				}
 			}
 		}
-		if len(comment) > 3 {
+		// Only parse 4th comment as localization if it doesn't start with rv:.
+		// For example Firefox on Ubuntu contains "rv:XX.X" in this field.
+		if len(comment) > 3 && !strings.HasPrefix(comment[3], "rv:") {
 			p.localization = comment[3]
 		}
 	}