Split extension up into smaller parts. Process in Loading controller. Response in action controller.

src/iOS.Extension/Models/Context.cs

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+using System;
+using Foundation;
+
+namespace Bit.iOS.Extension.Models
+{
+    public class Context
+    {
+        public NSExtensionContext ExtContext { get; set; }
+        public string ProviderType { get; set; }
+        public Uri Url { get; set; }
+        public string SiteTitle { get; set; }
+        public string Username { get; set; }
+        public string Password { get; set; }
+        public string OldPassword { get; set; }
+        public string Notes { get; set; }
+        public PasswordGenerationOptions PasswordOptions { get; set; }
+        public PageDetails Details { get; set; }
+    }
+}

src/iOS.Extension/Models/FillScript.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Newtonsoft.Json;
+
+namespace Bit.iOS.Extension.Models
+{
+    public class FillScript
+    {
+        public FillScript(PageDetails pageDetails)
+        {
+            if(pageDetails == null)
+            {
+                return;
+            }
+
+            DocumentUUID = pageDetails.DocumentUUID;
+
+            var loginForm = pageDetails.Forms.FirstOrDefault(form => pageDetails.Fields.Any(f => f.Form == form.Key && f.Type == "password")).Value;
+            if(loginForm == null)
+            {
+                return;
+            }
+
+            Script = new List<List<string>>();
+
+            var password = pageDetails.Fields.FirstOrDefault(f =>
+                f.Form == loginForm.OpId
+                && f.Type == "password");
+
+            var username = pageDetails.Fields.LastOrDefault(f =>
+                f.Form == loginForm.OpId
+                && (f.Type == "text" || f.Type == "email")
+                && f.ElementNumber < password.ElementNumber);
+
+            if(username != null)
+            {
+                Script.Add(new List<string> { "click_on_opid", username.OpId });
+                Script.Add(new List<string> { "fill_by_opid", username.OpId, "me@example.com" });
+            }
+
+            Script.Add(new List<string> { "click_on_opid", password.OpId });
+            Script.Add(new List<string> { "fill_by_opid", password.OpId, "mypassword" });
+
+            if(loginForm.HtmlAction != null)
+            {
+                AutoSubmit = new Submit { FocusOpId = password.OpId };
+            }
+        }
+
+        [JsonProperty(PropertyName = "script")]
+        public List<List<string>> Script { get; set; }
+        [JsonProperty(PropertyName = "autosubmit")]
+        public Submit AutoSubmit { get; set; }
+        [JsonProperty(PropertyName = "documentUUID")]
+        public object DocumentUUID { get; set; }
+        [JsonProperty(PropertyName = "properties")]
+        public object Properties { get; set; } = new object();
+        [JsonProperty(PropertyName = "options")]
+        public object Options { get; set; } = new object();
+        [JsonProperty(PropertyName = "metadata")]
+        public object MetaData { get; set; } = new object();
+
+        public class Submit
+        {
+            [JsonProperty(PropertyName = "focusOpid")]
+            public string FocusOpId { get; set; }
+        }
+    }
+
+}

src/iOS.Extension/Models/PageDetails.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Bit.iOS.Extension.Models
+{
+    public class PageDetails
+    {
+        public string DocumentUUID { get; set; }
+        public string Title { get; set; }
+        public string Url { get; set; }
+        public string DocumentUrl { get; set; }
+        public string TabUrl { get; set; }
+        public Dictionary<string, Form> Forms { get; set; }
+        public List<Field> Fields { get; set; }
+        public long CollectedTimestamp { get; set; }
+
+        public class Form
+        {
+            public string OpId { get; set; }
+            public string HtmlName { get; set; }
+            public string HtmlId { get; set; }
+            public string HtmlAction { get; set; }
+            public string HtmlMethod { get; set; }
+        }
+
+        public class Field
+        {
+            public string OpId { get; set; }
+            public int ElementNumber { get; set; }
+            public bool Visible { get; set; }
+            public bool Viewable { get; set; }
+            public string HtmlId { get; set; }
+            public string HtmlName { get; set; }
+            public string HtmlClass { get; set; }
+            public string LabelRight { get; set; }
+            public string LabelLeft { get; set; }
+            public string Type { get; set; }
+            public string Value { get; set; }
+            public bool Disabled { get; set; }
+            public bool Readonly { get; set; }
+            public string OnePasswordFieldType { get; set; }
+            public string Form { get; set; }
+        }
+    }
+
+}

src/iOS.Extension/Models/PasswordGenerationOptions.cs

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+using System;
+
+namespace Bit.iOS.Extension.Models
+{
+    public class PasswordGenerationOptions
+    {
+        public int MinLength { get; set; }
+        public int MaxLength { get; set; }
+        public bool RequireDigits { get; set; }
+        public bool RequireSymbols { get; set; }
+        public string ForbiddenCharacters { get; set; }
+    }
+}